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HONDA Zentaro
| Mathematics, Electronics and Informatics Division | Professor |
| Department of Electrical Engineering,Electronics, and Applied Physics |
Performance information
■ Paper- High-Field Magnetism of the Spin-1/2 Two-Leg-Ladder Antiferromagnet Cu(DEP)Cl2 under High Pressure
Taiki Morimoto; Etsuji Morikawa; Katsuki Nihongi; Takanori Kida; Yasuo Narumi; Zentaro Honda; Shunsuke Furukawa; Yoshiya Uwatoko; Koichi Kindo; Masayuki Hagiwara
Journal of the Physical Society of Japan, Volume：94, Number：2, Feb. 2025
Physical Society of Japan, Scientific journal
DOI：https://doi.org/10.7566/jpsj.94.024701
DOI ID：10.7566/jpsj.94.024701, ISSN：0031-9015, eISSN：1347-4073 - Low-dimensional magnetic properties of the ladder-like polynuclear complex Cu2(naphac)2(OH)2 (naphac = 3-(1-naphthyl)acrylate)
Zentaro Honda; Takashi Fujihara; Takanori Kida; Masayuki Hagiwara
Physica B: Condensed Matter, First page：416254, Last page：416254, Jun. 2024
Elsevier BV, Scientific journal
DOI：https://doi.org/10.1016/j.physb.2024.416254
DOI ID：10.1016/j.physb.2024.416254, ISSN：0921-4526 - High-field Magnetism of the Spin-1/2 Two-leg Ladder Cu(DEP)Cl2
Taiki Morimoto; Takanori Kida; Yasuo Narumi; Zentaro Honda; Koichi Kindo; Masayuki Hagiwara
Proceedings of the 29th International Conference on Low Temperature Physics (LT29), May 2023
Journal of the Physical Society of Japan, International conference proceedings
DOI：https://doi.org/10.7566/jpscp.38.011146
DOI ID：10.7566/jpscp.38.011146 - Ferromagnetic Cu and ferrimagnetic Co layered hydroxides incorporating cinnamate derivative layers
Zentaro Honda; Kei Saito; Takanori Kida; Masayuki Hagiwara
Journal of Magnetism and Magnetic Materials, First page：170815, Last page：170815, May 2023
Elsevier BV, Scientific journal
DOI：https://doi.org/10.1016/j.jmmm.2023.170815
DOI ID：10.1016/j.jmmm.2023.170815, ISSN：0304-8853 - Quantum paramagnetic states in the spin-1/2 distorted honeycomb-lattice Heisenberg antiferromagnet -- application to Cu$_2$(pymca)$_3$(ClO$_4$)
Tokuro Shimokawa; Ken'ichi Takano; Zentaro Honda; Akira Okutani; Masayuki Hagiwara
Physical Review B, Volume：106, First page：134410-1, Last page：134410-9, Oct. 2022, [Reviewed]
We investigate the ground-state phase diagram of a spin-1/2 honeycomb-lattice
antiferromagnetic (AF) Heisenberg model with three exchange interactions,
$J_{\rm A}$, $J_{\rm B}$, and $J_{\rm C}$ that is realized in a distorted
honeycomb-lattice antiferromagnet ${\rm Cu_2 (pymca)_3 (ClO_4)}$. We remeasured
the magnetic susceptibility of its polycrystalline sample with special care,
and determined the exchange parameters of this material through the comparison
with numerical results based on a quantum Monte Carlo (QMC) method. The QMC
method also provides a ground-state phase diagram in the $J_{\rm A}/J_{\rm
C}$-$J_{\rm B}/J_{\rm C}$ plane. The phase diagram consists of a small N${\rm
\acute{e } }$el phase and a gapped quantum paramagnetic phase surrounding the
N${\rm \acute{e } }$el phase. The latter includes six regimes of
hexagonal-singlet-type states and dimer-singlet-type states alternatingly
without boundaries closing the spin gap. We further calculate the equal-time
spin structure factor in each phase using the QMC method. The computed spin
dynamics by the exact diagonalization method exhibits continuums near and in
the AF phase. Characteristic four energy band structures in the state with
strong hexagonal-singlet-type correlations are informative to clarify the
ground-state of ${\rm Cu_2 (pymca)_3 (ClO_4)}$ by future neutron scattering
measurements.
DOI：https://doi.org/10.1103/PhysRevB.106.134410
DOI ID：10.1103/PhysRevB.106.134410, arXiv ID：arXiv:2206.13064 - Giant hysteretic effect in layered organic-inorganic hybrid magnets incorporating hydroxide and cinnamate layers
Zentaro Honda; Kanae Ichimura; Kei Saito; Takanori Kida; Masayuki Hagiwara
Solid State Sciences, Volume：123, First page：106793, Last page：106793, Jan. 2022
Elsevier BV, Scientific journal
DOI：https://doi.org/10.1016/j.solidstatesciences.2021.106793
DOI ID：10.1016/j.solidstatesciences.2021.106793, ISSN：1293-2558 - Large magnetic anisotropy in a quasi-1D ferromagnetic complex Co(sba)(H2O)2·H2O (sba = 4-sulfobenzoate)
Naoyuki Nomoto; Takashi Fujihara; Norihiko Kamata; Yuya Sawada; Takanori Kida; Masayuki Hagiwara; Zentaro Honda
Journal of Solid State Chemistry, Volume：290, First page：121527, Last page：121527, Oct. 2020
Elsevier BV, Scientific journal
DOI：https://doi.org/10.1016/j.jssc.2020.121527
DOI ID：10.1016/j.jssc.2020.121527, ISSN：0022-4596 - Preparation and magnetic properties of Mn-doped porous carbon nitride sheets
Zentaro Honda; Masato Saito; Fumito Takenaka; Norihiko Kamata; Yuya Sawada; Takanori Kida; Masayuki Hagiwara
Solid State Sciences, Volume：98, First page：106017, Last page：106017, Dec. 2019
Elsevier BV, Scientific journal
DOI：https://doi.org/10.1016/j.solidstatesciences.2019.106017
DOI ID：10.1016/j.solidstatesciences.2019.106017, ISSN：1293-2558 - Improved thermal stability of CsPbBr3 quantum dots by ligand exchange and their application to light-emitting diodes
Sasaki Hironao; Kamata Norihiko; Honda Zentaro; Yasuda Takeshi
APPLIED PHYSICS EXPRESS, Volume：12, Number：3, Mar. 2019, [Reviewed]
DOI：https://doi.org/10.7567/1882-0786/ab0019
DOI ID：10.7567/1882-0786/ab0019, ISSN：1882-0778, Web of Science ID：WOS:000458923600001 - Photoluminescence characterization of nonradiative recombination centers in MOVPE grown GaAs:N δ-doped superlattice structure
Md Dulal Haque; Norihiko Kamata; A. Z.M.Touhidul Islam; Zentaro Honda; Shuhei Yagi; Hiroyuki Yaguchi
Optical Materials, Volume：89, First page：521, Last page：527, Mar. 2019, [Reviewed]
© 2019 Elsevier B.V. Nonradiative recombination (NRR) centers in GaAs:N δ-doped superlattice (SL) structure grown by metal organic vapor phase epitaxy (MOVPE) are studied by two-wavelength-excited photoluminescence (PL) method. The PL intensity quenching due to the superposition of below-gap excitation (BGE) light at energies of 0.75, 0.80, 0.92, and 0.95 eV and an above-gap excitation (AGE) light either for the GaAs conduction band (1.69 eV) or E− band excitation (1.45 eV), respectively indicates the existence of NRR centers inside the GaAs:N δ-doped SL and GaAs layers. The AGE density and BGE density dependence of the PL intensity have been studied for both excitation schemes. Recombination model based on two levels has been proposed to interpret the experimental results and energy distribution of NRR centers inside the GaAs:N δ-doped SLs and GaAs layers. The defect-related parameters are estimated systematically by solving the rate equations and fitting the results with the experimental data that give a phenomenological insight into the sample.
ELSEVIER SCIENCE BV, English, Scientific journal
DOI：https://doi.org/10.1016/j.optmat.2019.01.047
Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85061552945&origin=inward
Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85061552945&origin=inward
DOI ID：10.1016/j.optmat.2019.01.047, ISSN：0925-3467, eISSN：1873-1252, SCOPUS ID：85061552945, Web of Science ID：WOS:000465509800074 - Magnetic Properties of One- and Two-Dimensional Functional Materials: Oxygen Molecules Encapsulated in Single-Walled Carbon Nanotubes and Copper Ions Embedded into Phthalocyanine Sheets
Masayuki Hagiwara; Takanori Kida; Kazuyuki Matsuda; Haruka Kyakuno; Yutaka Maniwa; Zentaro Honda; Yuya Sakaguchi; Makoto Tashiro; Masamichi Sakai; Takeshi Fukuda; Norihiko Kamata; Kouichi Okunishi
Feb. 2019, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.2174/1874842201906010027
DOI ID：10.2174/1874842201906010027 - High-field Magnetism of the Honeycomb-lattice Antiferromagnet Cu-2(pymca)(3)(ClO4)
Okutani Akira; Kida Takanori; Narumi Yasuo; Shimokawa Tokuro; Honda Zentaro; Kindo Koichi; Nakano Takehito; Nozue Yasuo; Hagiwara Masayuki
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, Volume：88, Number：1, Jan. 2019, [Reviewed]
DOI：https://doi.org/10.7566/JPSJ.88.013703
DOI ID：10.7566/JPSJ.88.013703, ISSN：0031-9015, Web of Science ID：WOS:000454420000003 - One-dimensional ferromagnetic array compound [Co-3(SBA)(2)(OH)(2) (H2O)(2)](n), (SBA=4-sulfobenzoate)
Honda Zentaro; Nomoto Naoyuki; Fujihara Takashi; Hagiwara Masayuki; Kida Takanori; Sawada Yuya; Fukuda Takeshi; Kamata Norihiko
SOLID STATE SCIENCES, Volume：80, First page：155, Last page：160, Jun. 2018, [Reviewed]
DOI：https://doi.org/10.1016/j.solidstatesciences.2018.04.003
DOI ID：10.1016/j.solidstatesciences.2018.04.003, ISSN：1293-2558, ORCID：51891523, Web of Science ID：WOS:000432824000020 - Heterobimetallic Dy-Cu coordination compound as a classical-quantum ferrimagnetic chain of regularly alternating Ising and Heisenberg spins
J. Torrico; J. Strecka; M. Hagiwara; O. Rojas; S. M. de Souza; Y. Han; Z. Honda; M. L. Lyra
J. Mag. Mag. Mater., Apr. 2018, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1016/j.jmmm.2018.04.021
DOI ID：10.1016/j.jmmm.2018.04.021 - Nonradiative recombination centers in GaAs:N δ-doped superlattice revealed by two-wavelength-excited photoluminescence
Md Dulal Haque; Norihiko Kamata; Takeshi Fukuda; Zentaro Honda; Shuhei Yagi; Hiroyuki Yaguchi; Yoshitaka Okada
Journal of Applied Physics, Volume：123, Number：16, Apr. 2018, [Reviewed]
© 2018 Author(s). We use two-wavelength-excited photoluminescence (PL) to investigate nonradiative recombination (NRR) centers in GaAs:N δ-doped superlattice (SL) structures grown by molecular beam epitaxy. The change in photoluminescence (PL) intensity due to the superposition of below-gap excitation at energies of 0.75, 0.80, 0.92, and 0.95 eV and above-gap excitation at energies of 1.69 or 1.45 eV into the GaAs conduction band and the E- band implies the presence of NRR centers inside the GaAs:N δ-doped SL and/or GaAs layers. The change in PL intensity as a function of the photon number density of below-gap excitation is examined for both bands, which enables us to determine the distribution of NRR centers inside the GaAs:N δ-doped SL and GaAs layers. We propose recombination models to explain the experimental results. Defect-related parameters that give a qualitative insight into the samples are investigated systematically by fitting the rate equations to the experimental data.
AMER INST PHYSICS, English, Scientific journal
DOI：https://doi.org/10.1063/1.5011311
Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85045973191&origin=inward
Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85045973191&origin=inward
DOI ID：10.1063/1.5011311, ISSN：0021-8979, eISSN：1089-7550, SCOPUS ID：85045973191, Web of Science ID：WOS:000431147200029 - Thermal stability of CsPbBr3 quantum dots and their application to light-emitting diodes
Hironao Sasaki; Norihiko Kamata; Zentaro Honda
Proceedings of the International Display Workshops, Volume：2, First page：597, Last page：600, 2018
We investigated the thermal stability of CsPbBr3 QDs with different ligands, and fabricated inverted-type CsPbBr3 QD light-emitting diodes. CsPbBr3 QDs with DDAB ligands showed higher thermal stability compared with those with OLA and OA ligands, and furthermore we improved luminance up to 1057 cd/m2 from 79 cd/m2
International Display Workshops, English, International conference proceedings
ISSN：1883-2490, SCOPUS ID：85072107945 - Surface magnetism of exfoliated alpha-Co hydroxide nanosheets
Zentaro Honda; Katsuki Anai; Masayuki Hagiwara; Takanori Kida; Akira Okutani; Masamichi Sakai; Takeshi Fukuda; Norihiko Kamata
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, Volume：107, First page：14, Last page：17, Aug. 2017, [Reviewed]
alpha-Co hydroxide nanosheets have been synthesized and their magnetic properties were investigated. By using a soft chemical exfoliation technique, exfoliated alpha-Co hydroxide nanosheets, typically with lateral dimensions of few 100 nm, were obtained in a colloidal suspension. The magnetic responses of a sample consisting of a colloidal suspension of the nanosheets indicates a ferromagnetic phase transition occurs at Tc=37.8 K. The magnetization possesses a linear temperature dependence at low temperatures below Tc. In addition to this observation, the magnetization is proportional to (1-T/Tc)(beta) with beta=0.8 +/- 0.1 near Tc, which imply that the surface magnetism dominates in the exfoliated alpha-Co hydroxide nanosheets.
PERGAMON-ELSEVIER SCIENCE LTD, English, Scientific journal
DOI：https://doi.org/10.1016/j.jpcs.2017.03.012
DOI ID：10.1016/j.jpcs.2017.03.012, ISSN：0022-3697, eISSN：1879-2553, ORCID：43893075, Web of Science ID：WOS:000401677300003 - Preparation and magnetic properties of highly nitrogen-containing nano-graphite
Zentaro Honda; Satoshi Kikuchi; Masayuki Hagiwara; Takanori Kida; Masamichi Sakai; Takeshi Fukuda; Norihiko Kamata
SOLID STATE SCIENCES, Volume：67, First page：59, Last page：63, May 2017, [Reviewed]
We report on a simple method to fabricate a nitrogen N-containing nano-graphite with magnetic moments. By using chlorinated phthalonitrile as the building block and potassium K as the coupling reagent, a paramagnetic N-containing nano-graphite has been successfully prepared. From transmission electron microscopy images, X-ray photoelectron spectroscopy, and X-ray diffraction experiments, it is evident that the reaction product consists of randomly connected flakes of nano-graphite that contains large amount of N-decorated vacancy and edges. Interestingly, this N-containing nano-graphite shows a Curie like paramagnetism that originates isolated magnetic moments on N-decorated vacancies and edges. These results make the N-containing nano-graphite a promising candidate for versatile applications in the fields of magnetics and spintronics. (C) 2017 Elsevier Masson SAS. All rights reserved.
ELSEVIER SCIENCE BV, English, Scientific journal
DOI：https://doi.org/10.1016/j.solidstatesciences.2017.03.009
DOI ID：10.1016/j.solidstatesciences.2017.03.009, ISSN：1293-2558, eISSN：1873-3085, ORCID：43893073, Web of Science ID：WOS:000401049200009 - Phthalocyanine based metal containing porous carbon sheet
Z. Honda; Y. Sakaguchi; M. Tashiro; M. Hagiwara; T. Kida; M. Sakai; T. Fukuda; N. Kamata
APPLIED PHYSICS LETTERS, Volume：110, Number：13, First page：33101, Mar. 2017, [Reviewed]
Highly-ordered fused-ring poly copper phthalocyanine (PCuPc) was prepared using copper octacyanophthalocyanine as a building block, and two-dimensional (2D) square superlattices were directly observed by the transmission electron microscopy. Remarkably, we have found a formation of polymer network that consists of a 2D porous PCuPc sheet in which the centers of phthalocyanine units are alternately occupied by Cu atom and vacancy. Using this "half-filling" PCuPc, it must be possible to create alternating arrangements for transition metal centers, and therefore control the magnetic properties of the 2D carbon sheets. Published by AIP Publishing.
AMER INST PHYSICS, English, Scientific journal
DOI：https://doi.org/10.1063/1.4979030
DOI ID：10.1063/1.4979030, ISSN：0003-6951, eISSN：1077-3118, ORCID：43893072, Web of Science ID：WOS:000397872300032 - Improved efficiency of light-emitting diodes using InP/ZnSe/ZnS quantum dots and Mg-doped zinc oxide
Hironao Sasaki; Takeshi Fukuda; Norihiko Kamata; Zentaro Honda
Proceedings of the International Display Workshops, Volume：2, First page：1360, Last page：1363, 2017
In light-emitting diodes with InP-based quantum dots (QDs), one problem is that the potential difference between zinc oxide and InP-based QD layer is large. In this study, we demonstrated the improved efficiency of InP-based device with multi-shell QDs and Mg-doped zinc oxide layer.
International Display Workshops, English, International conference proceedings
ISSN：1883-2490, SCOPUS ID：85056162127 - Photoluminescence characterization of carrier recombination centers in 4H-SiC substrates by utilizing below gap excitation
K. Kondo; N. Kamata; H. Yaguchi; S. Yagi; T. Fukuda; Z. Honda
Materials Science Forum, Volume：897 MSF, First page：315, Last page：318, 2017, [Reviewed]
© 2017 Trans Tech Publications, Switzerland. Though the crystal growth technology of SiC is improving steadily, it is still crucial to reduce crystalline defects which act as carrier recombination (CR) centers and deteriorate device performance. We detected CR centers in a p-type 4H-SiC substrate by observing the intensity change of photoluminescence due to the addition of a below-gap excitation (BGE) light of 0.93 eV. We noticed the temperature and the BGE density dependence of band edge (BE) emission in addition to donor acceptor pair (DAP) emission and discriminated the temperature effect from that of BGE. The BGE density dependence of the PL intensity quenching is different among the BE emission, B0- and C0-lines of the DAP, respectively. It gives us an important clue for understanding CR mechanisms inside the bandgap of SiC.
International conference proceedings
DOI：https://doi.org/10.4028/www.scientific.net/MSF.897.315
Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85020048562&origin=inward
Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85020048562&origin=inward
DOI ID：10.4028/www.scientific.net/MSF.897.315, ISSN：0255-5476, SCOPUS ID：85020048562 - Spectroscopic study of P3HT:PCBM deposited by electrospray deposition
Asuki Toda; Kazuya Takahira; Katsumi Suzuki; Takeshi Fukuda; Miru Hirahara; Norihiko Kamata; Zentaro Honda
POLYMER BULLETIN, Volume：73, Number：9, First page：2457, Last page：2462, Sep. 2016, [Reviewed]
We investigated a molecular order of poly(3-hexylthiophene-2,5-diyl):[6,6]-phenyl-C-61-butyric acid methyl ester thin film by judging from the Raman spectrum, and a crystallinity parameter was estimated as the molecular order of poly(3-hexylthiophene-2,5-diyl). The crystallinity parameter of spin-coated sample increased with increasing annealing temperature, and this result relates to the photoconversion efficiency of photovoltaic cell. This means that the high photoconversion efficiency can be obtained due to the high crystallinity parameter of poly(3-hexylthiophene-2,5-diyl), and this result is reasonable compared to the previous researches. In addition, the crystallinity parameter of electrosprayed thin film increased with increasing applied voltage, corresponding to the supply speed of solution. Since the droplet size increased with increasing supply speed, the evaporation speed of solvent (o-dichlorobenzene) became slow at the high applied voltage. Therefore, the slow evaporation speed of solvent caused the molecular order in the active layer. As a result, the maximum of approximately of 95 % was achieved even though the sample was not thermally annealed, and this value corresponds to the thermal annealing at 100 A degrees C.
SPRINGER, English, Scientific journal
DOI：https://doi.org/10.1007/s00289-016-1673-8
DOI ID：10.1007/s00289-016-1673-8, ISSN：0170-0839, eISSN：1436-2449, ORCID：30239258, Web of Science ID：WOS:000380695500009 - Crystal structures and magnetic properties of the honeycomb-lattice antiferromagnet M-2(pymca)(3)(ClO4), (M = Fe, Co, Ni)
Honda Zentaro; Kodama Takafumi; Hagiwara Masayuki; Kida Takanori; Okutani Akira; Sakai Masamichi; Fukuda Takeshi; Kamata Norihiko
Solid State Sciences, Volume：59, First page：15, Last page：18, Sep. 2016, [Reviewed]
DOI：https://doi.org/10.1016/j.solidstatesciences.2016.07.002
DOI ID：10.1016/j.solidstatesciences.2016.07.002, ISSN：1293-2558, ORCID：43893078, Web of Science ID：WOS:000381588200003 - Quantum dot light-emitting diode with ligand-controlled CuInS2/ZnS quantum dot
Masatomo Hishinuma; Junya Maki; Takeshi Fukuda; Norihiko Kamata; Zentaro Honda
23rd International Display Workshops in conjunction with Asia Display, IDW/AD 2016, Volume：1, First page：381, Last page：384, 2016
The organic ligand of the semiconductor quantum dot prevents the reduced current efficiency of the quantum dot light-emitting diode. In this research, we investigated the inverted structure with the CuInS2/ZnS quantum dots, and achieved the reduced threshold voltage by the decompression annealing to remove the organic ligand.
Society for Information Display, English, International conference proceedings
SCOPUS ID：85050586093 - Quantum dot light-emitting diode with ligand-controlled CulnS2/ZnS quantum dot
Masatomo Hishinuma; Junya Maki; Takeshi Fukuda; Norihiko Kamata; Zentaro Honda
23rd International Display Workshops in conjunction with Asia Display, IDW/AD 2016, Volume：2, First page：1270, Last page：1273, 2016
The organic ligand of the semiconductor quantum dot prevents the reduced current efficiency of the quantum dot light-emitting diode. In this research, we investigated the inverted structure with the CulnS2/ZnS quantum dots, and achieved the reduced threshold voltage by the decompression annealing to remove the organic ligand.
Society for Information Display, English, International conference proceedings
SCOPUS ID：85050503987 - Organic Photovoltaic Cell Fabricated by Electrospray Deposition Using Non-Halogenated Solvent
Kazuya Takahira; Asuki Toda; Katsumi Suzuki; Takeshi Fukuda; Norihiko Kamata; Zentaro Honda
2016 COMPOUND SEMICONDUCTOR WEEK (CSW) INCLUDES 28TH INTERNATIONAL CONFERENCE ON INDIUM PHOSPHIDE & RELATED MATERIALS (IPRM) & 43RD INTERNATIONAL SYMPOSIUM ON COMPOUND SEMICONDUCTORS (ISCS), 2016, [Reviewed]
An electrospray deposition (ESD) is a solution process, which has several advantages, such as the utilization of low concentration solution, the large device area using a continuous roll-to-roll process, and the simple setup without vacuum condition. By applying a high voltage to a solution, mists are generated from a tip of glass capillary, leading to the formation of organic thin film. Halogenated solvents are often used, but the amount of solvent should be reduced from the environmental aspect. Thus, by using the ESD and the non-halogenated solvent, the manufacturing process is friendly to environment. In this research, by measuring current density-voltage (J-V) characteristics and atomic force microscope (AFM) images, we evaluated OPV characteristics and root mean square (RMS) roughness of devices fabricated using the non-halogenated solvent. By adding 1,8-diiodooctane (DIO), the photo conversion efficiency (PCE) was drastically improved, and the PCE of 5.45% was achieved.
IEEE, English, International conference proceedings
Web of Science ID：WOS:000392285400195 - Preparation and magnetic properties of phthalocyanine-based carbon materials containing transition metals
Honda Z; Sato S; Hagiwara M; Kida T; Sakai M; Fukuda T; Kamata N
Journal of Applied Physics, Volume：120, Number：2, 2016, [Reviewed]
DOI：https://doi.org/10.1063/1.4956344
DOI ID：10.1063/1.4956344, ORCID：43893081, Web of Science ID：WOS:000381151200018 - Two-Wavelength Excited Photoluminescence in 4H-SiC Substrate -Dependence on BGE Power Density-
Kondo, Keitaro; Kamata, Norihiko; Yagi, Shuhei; Yaguchi, Hiroyuki; Fukuda, Takeshi; Honda, Zentaro
2016 COMPOUND SEMICONDUCTOR WEEK (CSW) INCLUDES 28TH INTERNATIONAL CONFERENCE ON INDIUM PHOSPHIDE & RELATED MATERIALS (IPRM) & 43RD INTERNATIONAL SYMPOSIUM ON COMPOUND SEMICONDUCTORS (ISCS), 2016, [Reviewed]
IEEE, English, International conference proceedings
Web of Science ID：WOS:000392285400077 - Improved Crystallinity of Poly(3-hexylthiophene-2,5-diyl):[6,6]-Phenyl-C-61 Butyric Acid Methyl Ester Film by Pulsed Electrospray Deposition
Katsumi Suzuki; Asuki Toda; Yingjie Liao; Takeshi Fukuda; Norihiko Kamata; Zentaro Honda
MOLECULAR CRYSTALS AND LIQUID CRYSTALS, Volume：621, Number：1, First page：124, Last page：128, Nov. 2015, [Reviewed]
We investigated crystallinity parameters and ordering domains of poly(3-hexylthiophene-2,5-diyl) blended in [6,6]-phenyl-C-61-butyric acid methyl ester films, which were fabricated by pulsed electrospray deposition methods. The crystallinity parameter and the ordering domain were estimated from Raman and optical absorption spectra, respectively. As a result, they were improved with decreasing the off time of pulse voltage, corresponding to the slow evaporation speed of solvent. In addition, both the space-charge limited current mobility and the photoconversion efficiency showed same trend. A highest photoconversion efficiency of 1.11 % was achieved without the thermal annealing process after depositing the active layer.
TAYLOR & FRANCIS LTD, English, Scientific journal
DOI：https://doi.org/10.1080/15421406.2015.1096443
DOI ID：10.1080/15421406.2015.1096443, ISSN：1542-1406, eISSN：1563-5287, Web of Science ID：WOS:000366673300019 - Synthesis and Magnetic Properties of Phthalocyanine Based Carbon Materials
Yuta Muto; Shun Sato; Masayuki Hagiwara; Takanori Kida; Masamichi Sakai; Takeshi Fukuda; Norihiko Kamata; Zentaro Honda
Trans. Mat. Res. Soc. Japan, Jul. 2015, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.14723/tmrsj.40.107
DOI ID：10.14723/tmrsj.40.107 - Trap and nonradiative centers in Ba3Si6O12N2:Eu2+ phosphors observed by thermoluminescence and two-wavelength excited photoluminescence methods
Tingting Li; Norihiko Kamata; Yosuke Kotsuka; Takeshi Fukuda; Zentaro Honda; Tomoyuki Kurushima
OPTICS EXPRESS, Volume：23, Number：13, First page：16511, Last page：16516, Jun. 2015, [Reviewed]
We have studied trap centers and nonradiative (NRR) recombination centers in a Ba3Si6O12N2:Eu2+ (BSON), one of promising materials for efficient and stable phosphors in white LED lamp applications. The energy distribution of four trap centers was obtained by thermoluminescence (TL) with the excitation energy of 5.59eV. By superposing a below-gap excitation light of 1.77eV and observing the intensity change of the 5d-4f emission of Eu2+ centered at 2.36eV in our two-wavelength excited photoluminescence (TWEPL) measurement, both transient and steady state enhancement were observed. Such peculiar behavior of photo-stimulation is attributed to the coexistence of trap centers and NRR centers: the photoexcitation of electrons from trap centers generates the transient component, while that from NRR centers maintains the steady state component. An optical detection of relatively faint contribution of defects became possible in order to improve further the reliability and efficiency of phosphor materials. (C) 2015 Optical Society of America
OPTICAL SOC AMER, English, Scientific journal
DOI：https://doi.org/10.1364/OE.23.016511
DOI ID：10.1364/OE.23.016511, ISSN：1094-4087, Web of Science ID：WOS:000358543300002 - Crystal Structure of the Spin 1/2 Honeycomb-Lattice Antiferromagnet Cu-2(pymca)(3)(ClO4)
Honda Zentaro; Kodama Takafumi; Kikukawa Reo; Hagiwara Masayuki; Kida Takanori; Sakai Masamichi; Fukuda Takeshi; Fujihara Takashi; Kamata Norihiko
Journal of the Physical Society of Japan, Volume：84, Number：3, Mar. 2015, [Reviewed]
DOI：https://doi.org/10.7566/JPSJ.84.034601
DOI ID：10.7566/JPSJ.84.034601, ISSN：0031-9015, ORCID：43893082, Web of Science ID：WOS:000350484400020 - Inverted quantum dot light-emitting diodes with CdSe/zns and CuInS2/ZnS quantum dots
Masatomo Hishinuma; Junya Maki; Takeshi Fukuda; Norihiko Kamata; Zentaro Honda
Proceedings of the International Display Workshops, Volume：2, First page：859, Last page：862, 2015
Since quantum dot light-emitting diodes have been interested as novel emitting devices due to the high stability and the controlled emission wavelength, several structures have been investigated. In this study, we succeeded in stabilizing the cun-ent density-voltage characteristics by optimizing the washing process of the synthesized CulnS2/ZnS quantum dot.
International Display Workshops, English, International conference proceedings
ISSN：1883-2490, SCOPUS ID：85056404605 - Hall resistivity and transverse magnetoresistivity generated in simultaneous presence of spin-polarized current and external magnetic field in a nonmagnetic bipolar conductor YH2
Sakai Masamichi; Takao Hiraku; Matsunaga Tomoyoshi; Tanaka Yusuke; Arai Tatsuya; Haruyama Shota; Otomo Takashi; Hirama Hiroaki; Sakuraba Takahito; Honda Zentaro; Higuchi Koji; Kitajima Akira; Oshima Akihiro; Hasegawa Shigehiko; Awano Hiroyuki
JAPANESE JOURNAL OF APPLIED PHYSICS, Volume：54, Number：1, Jan. 2015, [Reviewed]
DOI：https://doi.org/10.7567/JJAP.54.013001
DOI ID：10.7567/JJAP.54.013001, ISSN：0021-4922, Web of Science ID：WOS:000346957900018 - Suppressed sublimation of organic dye nano-particles embedded in sol-gel derived silica glass
Tatsuki Yamaki; Tomokazu Kurabayashi; Takeshi Fukuda; Norihiko Kamata; Zentaro Honda
21st International Display Workshops 2014, IDW 2014, Volume：1, First page：552, Last page：555, 2014
9, 10-diphenylanthracene and pyrene Nanoparticles dispersed in aqueous solutions were obtained by the reprecipitation method, and the sublimation of these materials were successfully suppressed by forming nanoparticle. In addition, further improved stability was realized by embedding in the silica glass thin film fabricated by the sol-gel process.
Society for Information Display, English, International conference proceedings
SCOPUS ID：85050568248 - Efficient ionization method of atomized droplet for fabricating multilayer organic light-emitting diode
Arata Sato; Takeshi Fukuda; Norihiko Kamata; Zentaro Honda
21st International Display Workshops 2014, IDW 2014, Volume：1, First page：763, Last page：766, 2014
We demonstrated an improved deposition rate of organic film by an efficient ionization method using a needle electrode, and it became 2.7 times faster by applying the high voltage. In addition, a maximum luminance of 4, 240 cd/m2 was achieved for a multilayer organic light-emitting diode with the electron blocking layer.
Society for Information Display, English, International conference proceedings
SCOPUS ID：84937068951 - Photoluminescence characterization of Zn- and Cs-vanadate phosphors
Tingting Li; Zentaro Honda; Takeshi Fukuda; Jiaolian Luo; Norihiko Kamata
PHOTOPTICS 2014 - Proceedings of 2nd International Conference on Photonics, Optics and Laser Technology, First page：63, Last page：65, 2014
We synthesized Zn3V2O8, CsVO3 and Cs3VO4 by sol-gel process and studied their crystalline and luminescent properties. By optimizing the sintering conditions, pure phases of aim samples including Cs3VO4 were obtained. The annealing temperatures of 450°C for CsVO3, 600°C for Cs3VO4, respectively, are lower than that of 750°C for Zn3V2O8 at the same duration of 12h. The Cs3VO4 showed quantum yield of 90% with the half-width of 120nm. It became clear that the Cs-V-O system, especially Cs3VO 4, is promising for white LED applications.
SciTePress, English, International conference proceedings
DOI：https://doi.org/10.5220/0004704800630065
DOI ID：10.5220/0004704800630065, SCOPUS ID：84906906906 - Room temperature ferromagnetism in a phthalocyanine based carbon material
Honda Z; Sato K; Hagiwara M; Kida T; Sakai M; Fukuda T; Kamata N
Journal of Applied Physics, Volume：115, Number：5, 2014, [Reviewed]
DOI：https://doi.org/10.1063/1.4863539
DOI ID：10.1063/1.4863539, ORCID：43893086, Web of Science ID：WOS:000331645900075 - Magnetoresistance Generated by Combination of Spin-Orbit Interaction and Applied Magnetic Field in Bipolar Conductors
Masamichi Sakai; Daisuke Kodama; Yoshihisa Okano; Takahito Sakuraba; Zentaro Honda; Akira Kitajima; Akihiro Oshima; Koji Higuchi; Shigehiko Hasegawa; Osamu Nakamura
JAPANESE JOURNAL OF APPLIED PHYSICS, Volume：52, Number：9, Sep. 2013, [Reviewed]
We have theoretically studied the magnetotransport properties in bipolar conductors under consideration of the simultaneous presence of an external magnetic field, left-right asymmetric carrier scattering due to spin-orbit interactions, and spin-polarized holes/electrons, predicting both positive and negative transverse magnetoresistance (TMR) terms, the mechanisms of which are completely different from the conventional mechanism in bipolar conductors. The positive TMR term is predicted only for the asymmetric carrier scattering case, the sign of which is the same (negative) between a hole and an electron. The other case of asymmetric scattering, the sign of which is opposite between a hole and an electron, was also determined to always show a negative TMR. Our proposed TMR was experimentally evidenced from the magnetotransport and magnetization measurements of a compensated metal, YH2. Also, application to logic gates is discussed on the basis of our proposed mechanism. (C) 2013 The Japan Society of Applied Physics
IOP PUBLISHING LTD, English, Scientific journal
DOI：https://doi.org/10.7567/JJAP.52.093001
DOI ID：10.7567/JJAP.52.093001, ISSN：0021-4922, Web of Science ID：WOS:000323884300022 - High-field magnetization of a bimetallic ferrimagnetic chain with alternating Ising and Heisenberg spins
Han Yibo; Kida Takanori; Ikeda Masami; Hagiwara Masayuki; Strecka Jozef; Honda Zentaro
Journal of the Korean Physical Society, Volume：62, Number：12, First page：2050, Last page：2053, Jul. 2013, [Reviewed]
DOI：https://doi.org/10.3938/jkps.62.2050
DOI ID：10.3938/jkps.62.2050, ISSN：0374-4884, ORCID：11366449, Web of Science ID：WOS:000321590800078 - High-field multi-frequency ESR in the S=2 Heisenberg antiferromagnetic chain compound MnCl3(bpy)
M. Hagiwara; M. Ikeda; Y. Idutsu; S. Kimura; Z. Honda
Journal of the Korean Physical Society, Jun. 2013, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.3938/jkps.62.2046
DOI ID：10.3938/jkps.62.2046 - Fabrication and characterization of Zn3V2O8 phosphor by sol-gel process
Tingting Li; Zentaro Honda; Takeshi Fukuda; Jiaolian Luo; Norihiko Kamata
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY, Volume：66, Number：2, First page：225, Last page：230, May 2013, [Reviewed]
By choosing zinc acetate dehydrate (Zn(CH3COO)(2)center dot 2H(2)O) and ammonium metavanadate (NH4VO3) as starting materials, we succeeded in fabricating Zn3V2O8 phase suitable for broad light emission by sol-gel process. X-ray diffraction (XRD), scanning electron microscope, photoluminescence (PL) and PL quantum yield (PL-QY) measurements have been performed for analyzing the relation between crystallographic and light emission characteristics. The PL-QY is determined by both the crystalline phase purity of the Zn3V2O8 phase defined by XRD patterns and the crystalline size. With optimizing the sintering condition at a slightly Zn-rich side, a pure Zn3V2O8 phase with enough large crystalline size was obtained with the PL-QY value of 52 %, which was higher than our previously obtained value by solid state reaction.
SPRINGER, English, Scientific journal
DOI：https://doi.org/10.1007/s10971-013-2997-6
DOI ID：10.1007/s10971-013-2997-6, ISSN：0928-0707, Web of Science ID：WOS:000319761000007 - High-Field Magnetization of the S=1/2 Two-Leg Spin-Ladder Antiferromagnets CuAX(2) (A=Diazine, X=Halogen)
Ikeda M; Honda Z; Sakai M; Kimura S; Okunishi K; Hagiwara M
JOURNAL OF LOW TEMPERATURE PHYSICS, Volume：170, Number：5-6, First page：296, Last page：301, Mar. 2013, [Reviewed]
DOI：https://doi.org/10.1007/s10909-012-0809-y
DOI ID：10.1007/s10909-012-0809-y, ISSN：0022-2291, Web of Science ID：WOS:000314183900013 - Photodegradation characteristics of sol-gel-derived glass-coated Eu-complex fabricated by solvothermal process using several silane alkoxides and solvents
Takeshi Fukuda; Sayaka Kato; Shinnosuke Akiyama; Zentaro Honda; Norihiko Kamata
OPTICAL MATERIALS, Volume：35, Number：1, First page：5, Last page：11, Nov. 2012, [Reviewed]
Instabilities of Eu-complex against ultraviolet (UV) light irradiation and annealing are important problems to solve before they can be practically applied in several applications, such as white light-emitting diodes, bioimaging sensors, and wavelength conversion films for silicon photovoltaic cells. By now, our research group demonstrated an encapsulation technique of tris (2-thenoyltrifluoroacetonato)(1,10-phenanthroline) europium (III) (Eu(TTA)(3)phen) using the solvothermal process as a final annealing process of sol-gel synthesis. In this paper, we investigated the optimized starting solution of the sol-gel process to improve the long-term stability of Eu (TTA)(3)phen by changing the silane alkoxide and solvent. The long-term stability was improved by annealing at the high pressure condition (solvothermal process), and the longest half brightness time of 9.8 h was achieved while irradiating with the UV light of 360 nm and 5 mW/cm(2). One possible reason for this result is that the hydrolysis of the sol-gel based glass network occurs more efficiently with the high-pressure annealing. As a result, the high-encapsulating efficiency was achieved due to the low organic component in the sol-gel-derived glass network around Eu (TTA)(3)phen. Furthermore, the particle structure with the diameter of less than 50 nm was obtained by coating the sol-gel-derived silica glass around Eu (TTA)(3)phen. (C) 2012 Elsevier B.V. All rights reserved.
ELSEVIER SCIENCE BV, English, Scientific journal
DOI：https://doi.org/10.1016/j.optmat.2012.06.001
DOI ID：10.1016/j.optmat.2012.06.001, ISSN：0925-3467, eISSN：1873-1252, Web of Science ID：WOS:000309648400002 - Improved optical-to-electrical conversion efficiency by doping silole derivative with low ionization potential
Takeshi Fukuda; Sho Kimura; Zentaro Honda; Norihiko Kamata; Keita Mori; Ken Hatano
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE, Volume：209, Number：11, First page：2324, Last page：2329, Nov. 2012, [Reviewed]
In this paper, we investigated photoconductive characteristics of blue-sensitive organic photoconductive devices with different silole derivatives. A most important finding is that an external quantum efficiency (EQE) increased with decreasing ionization potential of silole derivative. The significant improved EQE can be explained by the dislocation efficiency of photogenerated carriers in the organic layer, which is estimated from the photoluminescence (PL) quantum yield. A maximum EQE of 52% at -26 MV m(-1) was obtained by optimizing the molecular structure and the concentration of silole derivative. This value is the highest EQE for the reported solution-processed blue-sensitive organic photoconductive device. Another interesting result is that the signal-to-noise ratio was drastically improved by doping silole derivative. (C) 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
WILEY-V C H VERLAG GMBH, English, Scientific journal
DOI：https://doi.org/10.1002/pssa.201228242
DOI ID：10.1002/pssa.201228242, ISSN：1862-6300, Web of Science ID：WOS:000313729800040 - Magnetic Field-Induced Phase Transitions in the S=1/2 Two-Leg Spin-Ladder Material Cu(DEP)Br-2
Honda Zentaro; Katori Hiroko Aruga; Ikeda Masami; Hagiwara Masayuki; Okunishi Kouichi; Sakai Masamichi; Fukuda Takeshi; Kamata Norihiko
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, Volume：81, Number：11, Nov. 2012, [Reviewed]
DOI：https://doi.org/10.1143/JPSJ.81.113710
DOI ID：10.1143/JPSJ.81.113710, ISSN：0031-9015, Web of Science ID：WOS:000310509600013 - Magnetic Properties of the S=2 Heisenberg Antiferromagnetic Chain Compound MnCl3(bpy)
M. Hagiwara; Y. Idutsu; Z. Honda; S. Yamamoto
Journal of Physics: Conference Series, Apr. 2012, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1088/1742-6596/400/3/032014
DOI ID：10.1088/1742-6596/400/3/032014 - Improved Power Conversion Efficiency of Organic Photovoltaic Cell Fabricated by Electrospray Deposition Method by Mixing Different Solvents
Takeshi Fukuda; Kenji Takagi; Takashi Asano; Zentaro Honda; Norihiko Kamata; Hajime Shirai; Jungmyoung Ju; Yutaka Yamagata; Yusuke Tajima
JAPANESE JOURNAL OF APPLIED PHYSICS, Volume：51, Number：2, Feb. 2012, [Reviewed]
A smooth surface of the poly(3-hexylthiophene) (P3HT)-doped-(6,6)-phenyl-C61-butyric acid methyl ester (PCBM) thin film was achieved by mixing different solvents for the electrospray deposition method. As a result, the high power-conversion efficiency (PCE) of the bulk-heterojunction organic photovoltaic cell (OPV) was comparable to that obtained in the case of the spin-coating method. By optimizing the additional solvent in o-dichlorobenzene, the P3HT/PCBM active layer with the root-means-square roughness of 2.23nm and the PCE of 2.2% was fabricated employing acetonitrile as the additional solvent. (C) 2012 The Japan Society of Applied Physics
JAPAN SOC APPLIED PHYSICS, English, Scientific journal
DOI：https://doi.org/10.1143/JJAP.51.02BK12
DOI ID：10.1143/JJAP.51.02BK12, ISSN：0021-4922, Web of Science ID：WOS:000303481400090 - Negative Magnetoresistance Generated by Combination of Spin-Orbit Interaction and Applied Magnetic Field
Masamichi Sakai; Daisuke Kodama; Takahito Sakuraba; Zentaro Honda; Shigehiko Hasegawa; Akira Kitajima; Akihiro Oshima; Koji Higuchi; Osamu Nakamuray
JAPANESE JOURNAL OF APPLIED PHYSICS, Volume：51, Number：2, Feb. 2012, [Reviewed]
We have theoretically studied a negative magnetoresistance (MR) the mechanism of which is completely different from conventional mechanisms, i.e., spin-related mobility-increased mechanisms and orbital-motion-related mechanisms including a quantum interference effect. Our proposed negative MR is caused by the interplay between a spin-orbit interaction (SOI) and the Lorentz force due to an externally applied magnetic field. We have phenomenologically approached this mechanism using the Drude-like model, in which the carrier scattering by SOI is considered as a transverse scattering term in addition to the longitudinal scattering term due to usual collisions and the Lorentz force term. Also, the possibility of observing our proposed negative MR was discussed by comparing our prediction with experimental results for Ni and Gd films, which were newly measured in this study. (C) 2012 The Japan Society of Applied Physics
JAPAN SOC APPLIED PHYSICS, English, Scientific journal
DOI：https://doi.org/10.1143/JJAP.51.023001
DOI ID：10.1143/JJAP.51.023001, ISSN：0021-4922, Web of Science ID：WOS:000300627200035 - Solution-Processed Green-Sensitive Organic Photoconductive Device Using Rhodamine 6G
Takeshi Fukuda; Sho Kimura; Zentaro Honda; Norihiko Kamata
MOLECULAR CRYSTALS AND LIQUID CRYSTALS, Volume：566, First page：67, Last page：74, 2012, [Reviewed]
Since rhodamine 6G (R6G) has the selective absorption band at the green wavelength regions, the green-sensitive organic photoconductive device was demonstrated using R6G as a photoconductive layer. By optimizing the conductivity of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT: PSS) used as the carrier transport layer and the concentration of R6G, the maximum external quantum efficiency of 32.6% was obtained at the electric field of -34 MV/m. We found that the low-conductivity of the PEDOT: PSS layer was most important factor for the improved device performance. In addition, the signal-to-noise ratio (photocurrent/dark current) was improved by reducing the conductivity of the PEDOT: PSS layer, and the highest value of 60 was achieved.
TAYLOR & FRANCIS LTD, English, Scientific journal
DOI：https://doi.org/10.1080/15421406.2012.701830
DOI ID：10.1080/15421406.2012.701830, ISSN：1542-1406, eISSN：1563-5287, Web of Science ID：WOS:000308766800012 - Doping Effect of Ethylcarbazole-Contained-Silole in Blue-Sensitive Organic Photoconductive Device
Sho Kimura; Takeshi Fukuda; Zentaro Honda; Norihiko Kamata; Keita Mori; Ken Hatano
MOLECULAR CRYSTALS AND LIQUID CRYSTALS, Volume：566, First page：54, Last page：60, 2012, [Reviewed]
The photoconductive characteristics of the solution-processed organic device was improved by doping 1,1-dimethyl-2,5-bis(9-ethylcarbazol)-3,4-diphenylsilole(EtCz-silole) in poly(dioctylfluorenyl-co-benzo-thiadiazole) (F8BT). The maximum external quantum efficiency of 27% at - 38 MV/m was achieved when the doping concentration of EtCz-silole was 40 wt%. This value was approximately 160 times higher than that of the reference device with F8BT only (0.17%). In addition, the signal-to-noise ratio (S/N), i.e., photocurrent density/dark current density was improved by doping EtCz-silole due to the increased photocurrent density and the reduced dark current density. The highest S/N of 1.4 x 10(4) was observed by optimizing the concentration of EtCz-silole.
TAYLOR & FRANCIS LTD, English, Scientific journal
DOI：https://doi.org/10.1080/15421406.2012.701120
DOI ID：10.1080/15421406.2012.701120, ISSN：1542-1406, eISSN：1563-5287, Web of Science ID：WOS:000308766800010 - Ferrimagnetic spin-1/2 chain of alternating Ising and Heisenberg spins in arbitrarily oriented magnetic field
Strecka J; Hagiwara M; Han Y; Kida T; Honda Z; Ikeda M
Condensed Matter Physics, Volume：15, Number：4, 2012, [Reviewed]
DOI：https://doi.org/10.5488/CMP.15.43002
DOI ID：10.5488/CMP.15.43002, ORCID：51975589, Web of Science ID：WOS:000313603600004 - Surface morphology of fluorene thin film fabricated by electrospray deposition technique using two organic solvents: Application for organic light-emitting diodes
Takeshi Fukuda; Hirotaka Asaki; Takashi Asano; Kenji Takagi; Zentaro Honda; Norihiko Kamata; Jungmyoung Ju; Yutaka Yamagata
THIN SOLID FILMS, Volume：520, Number：1, First page：600, Last page：605, Oct. 2011, [Reviewed]
We achieved the reduced the surface roughness of poly[9,9-dioctylfluorenyl-2,7-diyl]-co-1,4-benzo-(2,1,3)-thiadiazole (F8BT) thin film fabricated by the electrospray deposition technique, using two organic solvents. The root mean square (RMS) roughness of the F8BT thin film was reduced by the addition of dimethyl sulfoxide (DMSO) in tetrahydrofuran (THF). A minimum RMS roughness of 23 nm was obtained by optimizing the ratio of DMSO in THF. We found that the low evaporation pressure of the additional organic solvent is an important factor in attaining a smooth surface for F8BT thin film. The current density-voltage-luminance characteristics of the organic light-emitting diode was improved by reducing the surface roughness of the F8BT layer. A maximum luminance of 36.7 cd/cm(2) was obtained, and it was more than 14 times higher than the reference device fabricated by the conventional single organic solvent technique. (C) 2011 Elsevier B.V. All rights reserved.
ELSEVIER SCIENCE SA, English, Scientific journal
DOI：https://doi.org/10.1016/j.tsf.2011.07.048
DOI ID：10.1016/j.tsf.2011.07.048, ISSN：0040-6090, Web of Science ID：WOS:000297441200102 - Generation of Spin Current in Bipolar Conductors
Masamichi Sakai; Takahito Sakuraba; Zentaro Honda; Shigehiko Hasegawa; Akira Kitajima; Koji Higuchi; Akihiro Oshima; Osamu Nakamura
JAPANESE JOURNAL OF APPLIED PHYSICS, Volume：50, Number：10, Oct. 2011, [Reviewed]
The ordinary Hall effect (OHE), which is caused by an external magnetic field, was studied as a mechanism for the generation of spin current. It has been theoretically elucidated that, under an open-circuit condition, the OHE can contribute to spin-current generation when spin-polarized electrons and holes are simultaneously present as mobile carriers. This OHE contribution to spin current generation is caused by the steady-state kinematics of electrons and holes whose transverse velocities have the same direction. Although anomalous Hall effects may contribute to spin-current generation, the OHE plays a principal role in the generation of spin current when electrons and holes have approximately the same transport characteristics. The experimental aspects of possible materials for the isomorphic electron and hole systems are argued on the basis of the experimental results of the magnetotransport measurement of yttrium dihydride and preliminary results of the magnetization measurement of hydrogenated films of gadolinium. (C) 2011 The Japan Society of Applied Physics
JAPAN SOC APPLIED PHYSICS, English, Scientific journal
DOI：https://doi.org/10.1143/JJAP.50.103002
DOI ID：10.1143/JJAP.50.103002, ISSN：0021-4922, Web of Science ID：WOS:000296085700041 - Possibility of the field-induces spin-nematic phase in LiCuVO4
M. Hagiwara; L. E. Svistov; T. Fujita; H. Yamamoto; S. kimura; K. Omura; A. Prokofiev; A. I. Smirnov; Z. Honda
J. Phys.: Conf. Ser, Sep. 2011, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1088/1742-6596/320/1/012049
DOI ID：10.1088/1742-6596/320/1/012049 - Bulk heterojunction organic photovoltaic cell fabricated by the electrospray deposition method using mixed organic solvent
Takeshi Fukuda; Takeshi Fukuda; Kenji Takagi; Kenji Takagi; Takashi Asano; Takashi Asano; Zentaro Honda; Norihiko Kamata; Keiji Ueno; Hajime Shirai; Jungmyoung Ju; Yutaka Yamagata; Yusuke Tajima
Physica Status Solidi - Rapid Research Letters, Volume：5, First page：229, Last page：231, Jul. 2011
A high-efficiency bulk heterojunction organic photovoltaic cell (OPV) was achieved by the electrospray deposition method. The surface roughness of the P3HT:PCBM thin film can be reduced using the mixed solvent consisting of o-dichlorobenzene (o-DCB) and acetone. The effect of acetone concentration is related to its dielectric constant. Under an optimized concentration of acetone in o-DCB (20 vol%), the P3HT/PCBM active layer with a smooth surface can be formed, and the power conversion efficiency of the OPV was 1.9%. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
DOI：https://doi.org/10.1002/pssr.201105232
DOI ID：10.1002/pssr.201105232, ISSN：1862-6254, SCOPUS ID：79959962240 - ソルボサーマル法を用いてガラス被覆したEu(TTA)3phenにおけるアルコキシシランの影響
秋山 真之介; 加藤 さやか; 福田 武司; 本多 善太郎; 鎌田 憲彦; 木島 直人
Volume：2011.1, First page：3410, Last page：3410, Mar. 2011
Japanese
DOI：https://doi.org/10.11470/jsapmeeting.2011.1.0_3410
DOI ID：10.11470/jsapmeeting.2011.1.0_3410, eISSN：2436-7613 - Photoluminescence Characterization of AlGaN-Based Crystals for Deep Ultraviolet Region
IGARASHI Kouhei; ISHIOKA Ryo; TSUKADA Yusuke; FUKUDA Takeshi; HONDA Zentaro; HIRAYAMA Hideki; KAMATA Norihiko
ITE Technical Report, Volume：35, First page：41, Last page：44, 2011
In order to improve the quality of AlGaN-based crystals for deep-UV light emission, we studied photoluminescence (PL) of four MOCVD-grown AlGaN quantum wells from standpoints of growth temperature and In incorporation. A growth at 880℃ with In flow was shown to be best among them based on the comparative measurements on PL spectra, temperature and excitation density dependence. With increasing excitation density, a saturation of nonradiative recombination centers takes place and increases internal quantum efficiency. A simplified rate-equation analysis yielded weak carrier density dependence of nonradiative recombination constant for each sample. Detailed optimization of growth condition with a minute In incorporation is promising for improving the internal quantum efficiency.
The Institute of Image Information and Television Engineers, Japanese
DOI：https://doi.org/10.11485/itetr.35.4.0_41
DOI ID：10.11485/itetr.35.4.0_41, CiNii Articles ID：130006088132 - Improved Optical Degradation Characteristics of Eu Complex Encapsulated by High-Pressure Annealing
Sayaka Kato; Takeshi Fukuda; Shinnosuke Akiyama; Zentaro Honda; Norihiko Kamata; Naoto Kijima
JAPANESE JOURNAL OF APPLIED PHYSICS, Volume：50, Number：1, Jan. 2011, [Reviewed]
The instability of Eu complexes against ultraviolet (UV) light irradiation is an important problem to solve before they can be practically applied in white light-emitting diodes. A novel technique of encapsulating tris(2-thenoyltrifluoroacetonato)(1,10-phenanthroline) europium(III) [Eu(TTA)(3)phen] was investigated using high-pressure annealing (solvothermal process) as a final process in the sol-gel synthesis. The photoluminescence and excitation spectra of encapsulated Eu(TTA)(3)phen samples synthesized by solvothermal and conventional annealing processes were almost the same. A half brightness time of 589 min was achieved while irradiating with UV light of 360 nm and 5mW/cm(2) by optimization of ammonia concentration and annealing temperature. The longest half brightness time was longer than that of encapsulated Eu(TTA)(3)phen synthesized by conventional thermal treatment. One possible reason for this result is that the chemical reaction of the sol-gel based glass network occurs more efficiently with high-pressure annealing. As a result, a high encapsulating efficiency was achieved owing to the small amount of organic component in the sol-gel derived glass network. (C) 2011 The Japan Society of Applied Physics
JAPAN SOC APPLIED PHYSICS, English, Scientific journal
DOI：https://doi.org/10.1143/JJAP.50.01BF02
DOI ID：10.1143/JJAP.50.01BF02, ISSN：0021-4922, Web of Science ID：WOS:000287523900043 - Blue-Sensitive Organic Photoconductive Device with MDMO-PPV Doped F8BT Layer
Takeshi Fukuda; Sho Kimura; Zentaro Honda; Norihiko Kamata
MOLECULAR CRYSTALS AND LIQUID CRYSTALS, Volume：539, First page：202, Last page：209, 2011, [Reviewed]
By doping poly(9,9-dioctylfluorene-alt-benzothiadiazole) (F8BT) with poly(2-methoxy-5-(3'-7'-dimethyloctyloxy)-1,4-phenylenevinylene) (MDMO-PPV), improved photoconductive characteristics were obtained for an organic photoconductive device fabricated by a conventional spin-coating process. This device had a maximum external quantum efficiency (EQE) of 2.4% at 15MV/m when the doping ratio of MDMO-PPV-doped F8BT was 50wt%. This EQE is approximately 5.1 times higher than that (0.47%) of a reference device with undoped F8BT. In addition, the signal-to-noise ratio (i.e., photocurrent/dark current) was improved by doping MDMO-PPV because of the reduced dark current density. The highest signal-to-noise ratio obtained was 447.
TAYLOR & FRANCIS LTD, English, Scientific journal
DOI：https://doi.org/10.1080/15421406.2011.566128
DOI ID：10.1080/15421406.2011.566128, ISSN：1542-1406, eISSN：1563-5287, Web of Science ID：WOS:000290678400032 - Improved Degradation Characteristics of Eu(TTA)(3)phen by Thermal Treatment in Organic Solvent
Shinnosuke Akiyama; Nayuta Funaki; Takeshi Fukuda; Zentaro Honda; Yoshihiro Ishimaru; Norihiko Kamata
IDW'11: PROCEEDINGS OF THE 18TH INTERNATIONAL DISPLAY WORKSHOPS, VOLS 1-3, First page：755, Last page：758, 2011, [Reviewed]
Optical degradation characteristics of Eu(TTA)(3)phen were improved by annealing in N,N-dimethylformamide (DMF). In addition, photoluminescence (PL) and PL excitation spectra of solvent-annealed Eu(TTA)(3)phen were almost the same as the original Eu(TTA)(3)phen. This result suggests that the solvent-annealing in DMF is benefit to improve the long-term stability of Eu(TTA)(3)phen.
INST IMAGE INFORMATION & TELEVISION ENGINEERS, English, International conference proceedings
ISSN：1883-2490, Web of Science ID：WOS:000393147800189 - Ultrafast study of charge generation in silole:fluorene mixed film for color selective organic photoconductive device
Fukuda Takeshi; Kobayashi Ryohei; Honda Zentaro; Kamata Norihiko; Mori Keita; Suzuki Yuu; Hatano Ken; Furube Akihiro
PHYSICA STATUS SOLIDI C: CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 8, NO 2, Volume：8, Number：2, 2011, [Reviewed]
DOI：https://doi.org/10.1002/pssc.201000454
DOI ID：10.1002/pssc.201000454, ISSN：1862-6351, Web of Science ID：WOS:000301533800113 - New High Magnetic Field Phase of the Frustrated S=1/2 Chain Compound LiCuVO4
L. E. Svistov; T. Fujita; H. Yamaguchi; S. Kimura; K. Omura; A. Prokofiev; A. I. Smirnov; Z. Honda; M. Hagiwara
Volume：93, First page：21, 2011, [Reviewed]
DOI：https://doi.org/10.1134/S0021364011010073
DOI ID：10.1134/S0021364011010073 - ソルボサーマル法を利用したガラス封止Eu錯体におけるジクロロメタンの影響
加藤 さやか; 秋山 真之介; 福田 武司; 本多 善太郎; 鎌田 憲彦; 木島 直人
Volume：2010.2, First page：2904, Last page：2904, Aug. 2010
Japanese
DOI：https://doi.org/10.11470/jsapmeeting.2010.2.0_2904
DOI ID：10.11470/jsapmeeting.2010.2.0_2904, eISSN：2436-7613 - Multi-frequency ESR studies on a Haldane magnet in a field-induced phase at ultra-low temperatures
M. Hagiwara; T. Kashiwagi; Y. Idutsu; Z. Honda; H. Miyazaki; I. Harada
J. Phys.: Conf. Ser., Apr. 2010, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1088/1742-6596/200/2/022012
DOI ID：10.1088/1742-6596/200/2/022012 - オートクレーブ法を用いたゾル-ゲルガラス封止Eu錯体の光劣化特性
加藤 さやか; 福田 武司; 本多 善太郎; 鎌田 憲彦; 木島 直人
Volume：2010.1, First page：3185, Last page：3185, Mar. 2010
Japanese
DOI：https://doi.org/10.11470/jsapmeeting.2010.1.0_3185
DOI ID：10.11470/jsapmeeting.2010.1.0_3185, eISSN：2436-7613 - Characterization of Nonradiative Recombination Centers in InGaN Quantum Wells by Two-Wavelength Excited Photoluminescence
YAMAGUCHI Tomohiko; IGARASHI Kouhei; FUKUDA Takeshi; HONDA Zentaro; KAMATA Norihiko
ITE Technical Report, Volume：34, First page：33, Last page：36, 2010
We investigated below-gap levels in MOCVD-grown Si-doped In_<0.16>Ga_<0.84>N/In_<0.02>Ga_<0.98>N Quantum well (QW) structures by an optical method of Two-wavelength Excited Photoluminescence, as the non-destructive, non-contacting spectroscopy without electrode. Though the dependence of intensity and energy (1.27〜1.95eV) of the below-gap excitation on the photoluminescence intensity change, we found that Si-doping in both barrier and well layers reduced the density of below-gap states in the QW region.
The Institute of Image Information and Television Engineers, Japanese
DOI：https://doi.org/10.11485/itetr.34.2.0_33
DOI ID：10.11485/itetr.34.2.0_33, CiNii Articles ID：130006087125 - Influence of Organic Solvent on Optical Degradation Characteristics of Sol-Gel Glass Coated Eu-Complex
Takeshi Fukuda; Shinnosuke Akiyama; Sayaka Kato; Zentaro Honda; Norihiko Kamata; Naoto Kijima
IDW'10: PROCEEDINGS OF THE 17TH INTERNATIONAL DISPLAY WORKSHOPS, VOLS 1-3, First page：1065, Last page：1068, 2010, [Reviewed]
We investigated the influence of organic solvent on the optical degradation of Eu-complex encapsulated by sol-gel derived glass networks. The most important finding is that the dielectric constant of the organic solvent affects the optical degradation characteristics of the encapsulated sample and the PL quantum efficiency of the sol-gel starting solution.
INST IMAGE INFORMATION & TELEVISION ENGINEERS, English, International conference proceedings
ISSN：1883-2490, Web of Science ID：WOS:000393718700289 - Improved Stability of Glass-Coated Eu-Complex Using Solvothermal Synthesis
Sayaka Kato; Shinnosuke Akiyama; Takeshi Fukuda; Zentaro Honda; Norihiko Kamata; Naoto Kijima
IDW'10: PROCEEDINGS OF THE 17TH INTERNATIONAL DISPLAY WORKSHOPS, VOLS 1-3, First page：1069, Last page：1072, 2010, [Reviewed]
We achieved an improved optical degradation characteristic of Eu-complex encapsulated by the silica glass network via a solvothermal synthesis. By optimizing the concentration of the organic solvent, a maximum half brightness time of more than 360 min was achieved, and it was 5.4-times longer than that of the reference sample.
INST IMAGE INFORMATION & TELEVISION ENGINEERS, English, International conference proceedings
ISSN：1883-2490, Web of Science ID：WOS:000393718700290 - High-Field Magnetism of the Spin-Ladder Material Na2Fe2(C2O4)(3)(H2O)(2)
Yamaguchi Hironori; Kimura Shojiro; Honda Zentaro; Okunishi Kouichi; Todo Synge; Kindo Koichi; Hagiwara Masayuki
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, Volume：78, Number：12, Dec. 2009, [Reviewed]
DOI：https://doi.org/10.1143/JPSJ.78.124701
DOI ID：10.1143/JPSJ.78.124701, ISSN：0031-9015, Web of Science ID：WOS:000272985600032 - pH and concentration dependence of luminescent characteristics in glass-encapsulated Eu-complex
Eimo Kin; Takeshi Fukuda; Sayaka Kato; Zentaro Honda; Norihiko Kamata
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY, Volume：50, Number：3, First page：409, Last page：414, Jun. 2009, [Reviewed]
In order to improve the stability of red phosphor with efficient and high color-purity characteristics under ultraviolet excitation, we encapsulated Eu(TTA)(3)phen(tris(2-thenoyltrifluoroacetonato)(1,10-phenanthroline)europium(III)) by sol-gel derived silica glasses and studied their photoluminescence (PL) characteristics. The dependence of pH values in the starting solution revealed that the process condition should be within the modest region with the optimum pH value around 6-7. The PL intensity increased with increasing the concentration of Eu(TTA)(3)phen initially, then it showed saturating tendency above 0.6 mol%. An improvement of reliability by the glass encapsulation was exemplified by monitoring the long-term PL intensity under constant UV irradiation. We consider that the glass network carefully prepared by sol-gel process is effective for preventing free oxygen and water from attacking Eu(TTA)(3)phen molecule without loss of PL output.
SPRINGER, English, Scientific journal
DOI：https://doi.org/10.1007/s10971-009-1955-9
DOI ID：10.1007/s10971-009-1955-9, ISSN：0928-0707, Web of Science ID：WOS:000265919100023 - Spin Excitations in the Field-Induced Phase of the Quasi-One-Dimensional S=1 Heisenberg Antiferromagnet NDMAP
T. Kashiwagi; M. Hagiwara; S. Kimura; H. Miyazaki; I. Harada; Z. Honda; K. Kindo
Appl. Magn. Reson., Apr. 2009, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1007/s00723-009-0027-1
DOI ID：10.1007/s00723-009-0027-1 - Optical degradation characteristics of sub-micrometer sized eu-complex encapsulated by sol-gel derived silica glass
Savaka Kato; Takeshi Fukuda; Zentaro Honda; Norihiko Kamata
IDW '09 - Proceedings of the 16th International Display Workshops, Volume：1, First page：391, Last page：394, 2009
We demonstrated a sub-micrometer sized Eu-complex encaps hyphenationulated by a sol-gel derived silica glass. The optical degradation characteristics were measured by changing the composition ratio of a sol-gel starting solution. We found that the composition ofdeionized water is important parameter for the efficient encapsulation around Eu-complex.
English, International conference proceedings
SCOPUS ID：77954168234 - Stability improvement in Eu-complex encapsulated by sol-gel derived silica glass using catalyst
Takeshi Fukuda; Shuhei Yamauchi; Zentaro Honda; Norihiko Kamata; Naoto Kijima
IDW '09 - Proceedings of the 16th International Display Workshops, Volume：2, First page：993, Last page：996, 2009
An organic-inorganic hybrid emitting film with Eu-complex was realized via a sol-gel process using phenyltrimethoxysilane and diethyldimethoxysilane as encapsulating agents. In addition, we achieved the improvement in the thermal stability and the long term stability while irradiating the ultraviolet (UV) light by adding acetic acid as the catalyst.
English, International conference proceedings
SCOPUS ID：77954167934 - Efficient electrospray deposition of organic thin film using cylindrical acryl pipe
Hirotaka Asaki; Takashi Asano; Takeshi Fukuda; Zentaro Honda; Norihiko Kamata
IDW '09 - Proceedings of the 16th International Display Workshops, Volume：2, First page：1101, Last page：1104, 2009
We proposed a novel fabrication method for organic devices using the electrospray deposition process in combination with an acryl pipe. The charged aeryl pipe can control the direction of organic spray, resulting in the selective deposition area and high deposition rate. The surface morphology and optical characteristics were investigated.
English, International conference proceedings
SCOPUS ID：77954164955 - オートクレーブを利用したゾル-ゲルガラス封止Eu錯体の信頼性向上＜論文＞
福田 武司; 加藤 さやか; 本多 善太郎; 鎌田 憲彦; 木島 直人
Volume：43, First page：7, Last page：12, 2009
type:text
Optical degradation characteristic of Eu-complex is one of the most important problems to solve for practical white light-emitting diodes. Eu-complex generates bright red emission by the ultraviolet (UV) irradiation; however, it is easily decomposed by reacting oxygen and vapor when the UV light is irradiated. Therefore the photoluminescence (PL) intensity was reduced by irradiating UV light. In this paper, we demonstrated the drastic improved long term stability by annealing in an autoclave container compared to a conventional annealing in an electric furnace. By optimizing the concentration of starting solution of sol-gel process and the annealing temperature, the PL intensity change of Eu-complex was reduced. In addition, the PL quantum yield of encapsulated sample was almost same as that of Eu-complex without the encapsulation. The most likely cause is that the dense glass network was formed around Eu-complex during the high pressure annealing. These results indicate the autoclave process is useful technique to improve the optical degradation characteristics, and the practical long term stability will be realized in a near future by optimizing the fabrication condition.
Japanese
DOI：https://doi.org/10.24561/00016433
DOI ID：10.24561/00016433, CiNii Articles ID：120006388238 - Optical Degradation Characteristics of nano-sized Eu-Complex Encapsulated by Sol-Gel Derived Silica Glass
KATO Sayaka; FUKUDA Takeshi; HONDA Zentaro; KAMATA Norihiko
ITE Technical Report, Volume：33, First page：5, Last page：8, 2009
Since Eu-complex generates bright red-emission by a violet excitation, it has been attracted much attention as phosphors for white light-emitting diodes (LEDs). However, the organic-ligand of Eu-complex is easily decomposed by free oxygen and water. In previous papers, we demonstrated the encapsulation technique of Eu-complex using the sol-gel derived silica glass. In this research, we used tetraethoxysilane, deionized water, ethanol, N,N-Dimethoxyformamide, and ammonia for a starting solution to form the silica glass around Eu-complex. By optimizing the fabrication condition, the nano-sized Eu(TTA)_3phen encapsulated by the sol-gel derived silica glass was successfully achieved. The Eu(TTA)_3phen powder showed a half brightness time of 67 minute while irradiating the ultraviolet light with the center wavelength of 360nm and the optical intensity of 5mW/cm^2, however, that of the encapsulated sample indicated that of 262 minutes. The improvement in the half brightness time was realized approximately 4-times by optimizing the encapsulating process.
The Institute of Image Information and Television Engineers, Japanese
DOI：https://doi.org/10.11485/itetr.33.29.0_5
DOI ID：10.11485/itetr.33.29.0_5, CiNii Articles ID：130006085215 - Intercalated Formation of Organic-inorganic Hybrids Based on the Layered Perovskite Framework in Organic Langmuir-Blodgett films
Zentaro Honda; Takeshi Fukuda; Norihiko Kamata
Journal of the Illuminating Engineering Institute of Japan (Shomei Gakkai Shi), Volume：93, Number：11, First page：794, Last page：797, 2009, [Reviewed]
Organic-inorganic hybrids based on the layered perovskite framework ([CH3(CH2)17NH2]2PbI 4 and [CH3(CH2)17NH 2]2PbCl4) have been naturally formed by intercalating lead hallide into organic (alkylanmiine) Langmuir-Blodgett films. Only diffraction peaks corresponding to (0 0 n) of the layered perovskite were observed in the X-ray diffraction pattern of the deposited film. X-ray diffraction measurement demonstrated that the layer structure is oriented parallel to the film plane. The deposited film showed sharp and strong UV-Vis absorption at 390 nm, which is charactristic of Wannier exeiton in lead halide-alkylammonium multi-layered perovskites, thus demonstrating the formation of the layered perovskite structure.Copyright ©.
Japanese, Scientific journal
DOI：https://doi.org/10.2150/jieij.93.794
DOI ID：10.2150/jieij.93.794, ISSN：0019-2341, SCOPUS ID：77951792282 - Read-Out Frequency Response of Solution-Processed Organic Photoconductive Devices
Takeshi Fukuda; Mitsuo Komoriya; Ryotaro Mori; Zentaro Honda; Khorou Takahashi; Norihiko Kamata
MOLECULAR CRYSTALS AND LIQUID CRYSTALS, Volume：504, First page：212, Last page：222, 2009, [Reviewed]
A solution-processed organic photoconductive device sensitive to the only blue-light was demonstrated using poly(9,9-dioctylfluorene-alt-benzothiadiazole) (F8BT). The spectral selectivity was good enough to divide the incident light into a blue component, indicating the possibility of color separation without a prism for video cameras in combination with green-and red-sensitive devices. The maximum conversion efficiency of 190 mu A/W was observed while irradiating the blue-light (475 nm) and applying the voltage (2.4 V). In addition, the response speed of more than 30 Hz was achieved, and it was fast enough to apply this photoconductive device to practical applications.
TAYLOR & FRANCIS LTD, English, Scientific journal
DOI：https://doi.org/10.1080/15421400902950212
DOI ID：10.1080/15421400902950212, ISSN：1542-1406, Web of Science ID：WOS:000267463500027 - 21aQH-7 Magnetic properties of Li doped S=1/2 spin ladder compound Cu(Q)X_2
Honda Z.; Kamata N.; Hukuda T.; Aruga Katori H.; Hagiwara M.
Meeting Abstracts of the Physical Society of Japan, Volume：63, Number：0, First page：377, Last page：377, 2008, [Reviewed]
The Physical Society of Japan, Japanese
DOI：https://doi.org/10.11316/jpsgaiyo.63.2.3.0_377_1
DOI ID：10.11316/jpsgaiyo.63.2.3.0_377_1, CiNii Articles ID：110006983851 - Flip-flop behaviors in triple-fold spin transitions and the large magnetoresistance in the magnet Ca3(Co1-xM x)2O6(M:metal)
Jiaolian Luo; Koji Yamada; Zentarou Honda; Takashi Tayama; Toshirou Sakakibara; Isao J. Ohsugi
Przeglad Elektrotechniczny, Volume：82, Number：12, First page：61, Last page：64, 2006
The frustrated spin system of quasi-one dimension magnet of Ca 3Co2-xMxO6 (M:metal) single crystals has been investigated in a temperature range between 10 K and RT and in a magnetic field range up to 20 T. We aim at the application of the unstable spin state as a flip-flop circuit device using the behavior of the spin frustration in the future. For these purposes, the basic behaviors of the magnetism and the magneto-transport phenomena were studied by the samples of various metals M. The stable state and unstable state of the magneto-resistance were apparently discriminated.
English, Scientific journal
ISSN：0033-2097, SCOPUS ID：33845971266 - High-field magnetization of the pyrochlore compound Gd2Ti2O7
Narumi Yasuo; Kikkawa Akiko; Katsumata Koichi; Honda Zentaro; Hagiwara Masayuki; Kindo Koichi
LOW TEMPERATURE PHYSICS, PTS A AND B, Volume：850, First page：1113, Last page：+, 2006, [Reviewed]
ISSN：0094-243X, Web of Science ID：WOS:000243396400501 - New development of sensitive magnetic sensors for nondestructive evaluation of structural materials
K Yamada; Z Honda; H Ogawa; JL Luo; Y Isobe
ICMIT 2005: MECHATRONICS, MEMS, AND SMART MATERIALS, Volume：6040, 2005, [Reviewed]
The diagnosis of iron-based materials was performed by using many magnetic sensors such as a small Hall element for leakage flux observations after polarizations, a locally sensitive fluxgate sensor available down to 100pT, by a pick-up coil for magnetic noise observation and by a triple-fold coil for eddy current detector. The spatially high resolution of the magnetic sensors was attained as narrow as 100 mu m or less with the same order lift-off distance depending on the situation. By using these detectors, we detected the positions with the relatively high stress in comparison with the other positions. Residual stress detection less than 0.1 % in ferromagnetic material was attained in this study by deriving the expectations of field strength for magnetic noise occurrence. Positions with small holes inside the material were precisely detected by an eddy current detector, composed of a triple-fold coil with thin amorphous ribbon and attached from the material surface. The small magnetic field emission from a new type flux gate sensor was also attained by composing a double coil set for flux gate with the opposite coil current coil each other.
SPIE-INT SOC OPTICAL ENGINEERING, English, International conference proceedings
DOI：https://doi.org/10.1117/12.673598
DOI ID：10.1117/12.673598, ISSN：0277-786X, Web of Science ID：WOS:000235358400001 - New development of sensitive magnetic sensors for nondestructive evaluation of structural materials
K Yamada; Z Honda; H Ogawa; JL Luo; Y Isobe
ICMIT 2005: INFORMATION SYSTEMS AND SIGNAL PROCESSING, Volume：6041, First page：XVII, Last page：XXII, 2005, [Reviewed]
The diagnosis of iron-based materials was performed by using many magnetic sensors such as a small Hall element for leakage flux observations after polarizations, a locally sensitive fluxgate sensor available down to 100pT, by a pick-up coil for magnetic noise observation and by a triple-fold coil for eddy current detector. The spatially high resolution of the magnetic sensors was attained as narrow as 100 mu m or less with the same order lift-off distance depending on the situation. By using these detectors, we detected the positions with the relatively high stress in comparison with the other positions. Residual stress detection less than 0.1 % in ferromagnetic material was attained in this study by deriving the expectations of field strength for magnetic noise occurrence. Positions with small holes inside the material were precisely detected by an eddy current detector, composed of a triple-fold coil with thin amorphous ribbon and attached from the material surface. The small magnetic field emission from a new type flux gate sensor was also attained by composing a double coil set for flux gate with the opposite coil current coil each other.
SPIE-INT SOC OPTICAL ENGINEERING, English, International conference proceedings
DOI：https://doi.org/10.1117/12.673598
DOI ID：10.1117/12.673598, ISSN：0277-786X, Web of Science ID：WOS:000235359700001 - New development of sensitive magnetic sensors for nondestructive evaluation of structural materials
K Yamada; Z Honda; H Ogawa; J Luo; Y Isobe
ICMIT 2005: CONTROL SYSTEMS AND ROBOTICS, PTS 1 AND 2, Volume：6042, First page：XXI, Last page：XXVI, 2005, [Reviewed]
The diagnosis of iron-based materials was performed by using many magnetic sensors such as a small Hall element for leakage flux observations after polarizations, a locally sensitive fluxgate sensor available down to 100pT, by a pick-up coil for magnetic noise observation and by a triple-fold coil for eddy current detector. The spatially high resolution of the magnetic sensors was attained as narrow as 100 pm or less with the same order lift-off distance depending on the situation. By using these detectors, we detected the positions with the relatively high stress in comparison with the other positions. Residual stress detection less than 0.1 % in ferromagnetic material was attained in this study by deriving the expectations of field strength for magnetic noise occurrence. Positions with small holes inside the material were precisely detected by an eddy current detector, composed of a triple-fold coil with thin amorphous ribbon and attached from the material surface. The small magnetic field emission from a new type flux gate sensor was also attained by composing a double coil set for flux gate with the opposite coil current coil each other.
SPIE-INT SOC OPTICAL ENGINEERING, English, International conference proceedings
DOI：https://doi.org/10.1117/12.673598
DOI ID：10.1117/12.673598, ISSN：0277-786X, Web of Science ID：WOS:000235304400001 - Dynamics of an anisotropic Haldane antiferromagnet in a strong magnetic field
A. Zheludev; S. M. Shapiro; Z. Honda; K. Katsumata; B. Grenier; E. Ressouche; L. P. Regnault; Y. Chen; P. Vorderwisch; H. J. Mikeska; A. K. Kolezhuk
Physical Review B - Condensed Matter and Materials Physics, Volume：69, Number：5, Feb. 2004, [Reviewed]
We report the results of elastic and inelastic neutron-scattering experiments on the Haldane-gap quantum antiferromagnet Ni(C5D14N2)5N(PF6) performed at mK temperatures in a wide range of magnetic field applied parallel to the S = 1 spin chains. Even though this geometry is closest to an ideal axially symmetric configuration, the Haldane gap closes at the critical field Hc∼4T, but reopens again at higher fields. The field dependence of the two lowest magnon modes is experimentally studied and the results are compared with the predictions of several theoretical models. We conclude that of several existing theories, only the recently proposed model [Zheludev et al., cond-mat/0301424] is able to reproduce all the features observed experimentally for different field orientations. © 2004 The American Physical Society.
English, Scientific journal
DOI：https://doi.org/10.1103/PhysRevB.69.054414
DOI ID：10.1103/PhysRevB.69.054414, ISSN：1550-235X, SCOPUS ID：4444241925 - Massive triplet excitations in a magnetized anisotropic Haldane spin chain
A Zheludev; Z Honda; CL Broholm; K Katsumata; SM Shapiro; A Kolezhuk; S Park; Y Qiu
PHYSICAL REVIEW B, Volume：68, Number：13, Oct. 2003, [Reviewed]
Inelastic neutron scattering experiments on the Haldane-gap quantum antiferromagnet Ni(C5D14N2)(2)N-3(PF6) are performed at mK temperatures in magnetic fields of almost twice the critical field H-c applied perpendicular to the spin chains. Above H-c a reopening of the spin gap is clearly observed. In the high-field Neel-ordered state the spectrum is dominated by three distinct excitation branches. A theoretical model consistently describing the experimental data is proposed.
AMERICAN PHYSICAL SOC, English, Scientific journal
DOI：https://doi.org/10.1103/PhysRevB.68.134438
DOI ID：10.1103/PhysRevB.68.134438, ISSN：1098-0121, Web of Science ID：WOS:000186422400092 - Zeeman Levels with Exotic Field Dependence in the High Field Phase of an S=1 Heisenberg Antiferromagnetic Chain
M. Hagiwara; Z. Honda; K. Katsumata; A. K. Kolezhuk; H. J. Mikeska
Physical Review Letters, Oct. 2003, [Reviewed]
English, Scientific journal - Heat capacity of a new S = 1/2 antiferromagnet on the Kagome lattice
Z Honda; K Katsumata; K Yamada
PHYSICA B-CONDENSED MATTER, Volume：329, First page：1032, Last page：1033, May 2003, [Reviewed]
A new spin S = 1/2 antiferromagnet on the Kagome lattice {Cu-3(titmb)2(OCOCH3)(6)} . H2O {titmb = 1,3,52 tris(imidazol-1-ylmethyl)-2,4,6 trimethylbenzene} has been grown and we measured the heat capacity at low temperatures by a relaxation method. We have found two-peak structure in the temperature dependence of the heat capacity. The higher temperature peak is explained as due to a short-range magnetic ordering in two dimension. The lower temperature peak suggests the presence of an energy gap in this S = 1/2 Kagome antiferromagnet. (C) 2003 Elsevier Science B.V. All rights reserved.
ELSEVIER SCIENCE BV, English, Scientific journal
DOI：https://doi.org/10.1016/S0921-4526(02)02231-7
DOI ID：10.1016/S0921-4526(02)02231-7, ISSN：0921-4526, Web of Science ID：WOS:000183802700279 - Specific heat of S=1 quasi-1D antiferromagnet NDMAP in magnetic fields
H Tsujii; Z Honda; B Andraka; K Katsumata; Y Takano
PHYSICA B-CONDENSED MATTER, Volume：329, First page：975, Last page：976, May 2003, [Reviewed]
NDMAP, Ni(C5H14N2)(2)N-3(PF6), is a quasi-one-dimensional S = 1 Heisenberg antiferromagnet with Haldane-gap energies of 22 and 5.5 K for excitations polarized parallel and perpendicular to the chain c-axis, respectively. We have extended the specific-heat measurements by Honda et al. in this compound to 150 mK in temperature and 18 T in magnetic field, employing a novel relaxation calorimeter. The experiment provides an accurate determination of the exponent for the transition line for the field-assisted ordered phase. In addition, a new feature has been found in the phase diagram at around 14 T. (C) 2003 Elsevier Science B.V. All rights reserved.
ELSEVIER SCIENCE BV, English, Scientific journal
DOI：https://doi.org/10.1016/S0921-4526(02)02041-0
DOI ID：10.1016/S0921-4526(02)02041-0, ISSN：0921-4526, Web of Science ID：WOS:000183802700254 - Zeeman levels with exotic field dependence in the high field phase of an [formula presented] heisenberg antiferromagnetic chain
M. Hagiwara; Z. Honda; K. Katsumata; A. K. Kolezhuk; H. J. Mikeska
Physical Review Letters, Volume：91, Number：17, 2003, [Reviewed]
We have performed electron spin resonance measurements over a wide frequency and magnetic field range on a single crystal of the [Formula presented] quasi-one-dimensional Heisenberg antiferromagnet [Formula presented]. We observed gapped excitation branches above the critical field [Formula presented] where the Haldane gap closes. These branches are analyzed by a phenomenological field theory using the complex-field [Formula presented] model. A satisfactory agreement between experiment and theory is obtained. © 2003 The American Physical Society.
English, Scientific journal
DOI：https://doi.org/10.1103/PhysRevLett.91.177601
DOI ID：10.1103/PhysRevLett.91.177601, ISSN：1079-7114, SCOPUS ID：85038305511 - Quasielastic neutron scattering in the high-field phase of a haldane antiferromagnet
A Zheludev; Z Honda; Y Chen; CL Broholm; K Katsumata; SM Shapiro
PHYSICAL REVIEW LETTERS, Volume：88, Number：7, Feb. 2002, [Reviewed]
Inelastic neutron scattering experiments on the Haldane-gap quantum antiferromagnet Ni(C5D14N2)(2)N-3(PF6) are performed in magnetic fields below and above the critical field H-c at which the gap closes. Quasielastic neutron scattering is found for H > H-c, indicating topological excitations in the high-field phase.
AMERICAN PHYSICAL SOC, English, Scientific journal
DOI：https://doi.org/10.1103/PhysRevLett.88.077206
DOI ID：10.1103/PhysRevLett.88.077206, ISSN：0031-9007, Web of Science ID：WOS:000174021100069 - Field-induced commensurate long-range order in the Haldane-gap system Ni(C5H14N2)(2)N-3
A Zheludev; Z Honda; K Katsumata; R Feyerherm; K Prokes
EUROPHYSICS LETTERS, Volume：55, Number：6, First page：868, Last page：873, Sep. 2001, [Reviewed]
High-field neutron diffraction studies of the new quantum-disordered S=1 linear-chain antiferromagnet Ni(C5H14N2)(2)N-3(ClO4) (NDMAZ) are reported. At T=70 mK, at a critical field H-c = 13.4 T applied along the [013] direction, a phase transition to a commensurate Neel-like ordered state is observed. The results are discussed in the context of existing theories of quantum phase transitions in Haldane-gap antiferromagnets, and in comparison with previous studies of the related system Ni(C5H14N2)(2)N-3(PF6) (NDMAP).
E D P SCIENCES, English, Scientific journal
ISSN：0295-5075, Web of Science ID：WOS:000171086500018 - Magnetization measurement on the S=1 quasi-one-dimensional heisenberg antiferromagnet Ni(C5H14N2)(2)N-3(PF6)
Z Honda; K Katsumata
JOURNAL OF APPLIED PHYSICS, Volume：89, Number：11, First page：7338, Last page：7340, Jun. 2001, [Reviewed]
We have performed magnetization (M) measurements on the S = 1 quasi-one-dimensional Heisenberg antiferromagnet, Ni(C5H14N2)(2)N-3(PF6) (NDMAP) with a vibrating sample magnetometer in a static field (H). In the temperature (T) dependence of the susceptibility (M/H), we observed that a transition from the gapped phase to a gapless one occurs at a finite H. On increasing H further, we observed a bending in the M/H-T curve and the M/H takes almost constant value below the bending temperature (T-B). Since T-B corresponds to the critical temperature determined from heat capacity measurements, we identify the T independent susceptibility to the perpendicular susceptibility of an anisotropic antiferromagnet. We also observed a change in the M-H curves of NDMAP at finite H. The value of H where M changes corresponds to the phase boundary between the field induced long-range ordered and paramagnetic phases determined from the heat capacity measurement. (C) 2001 American Institute of Physics.
AMER INST PHYSICS, English, Scientific journal
ISSN：0021-8979, Web of Science ID：WOS:000169151700245 - Direct observation of the quantum energy gap in S=1/2 tetragonal cuprate antiferromagnets
K. Katsumata; M. Hagiwara; Z. Honda; J. Satooka
Europhysics Letters, May 2001, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1209/epl/i2001-00276-4
DOI ID：10.1209/epl/i2001-00276-4 - Haldane-gap excitations in the low-H-c one-dimensional quantum antiferromagnet Ni(C5D14N2)(2)N-3(PF6)
A Zheludev; Y Chen; CL Broholm; Z Honda; K Katsumata
PHYSICAL REVIEW B, Volume：63, Number：10, Mar. 2001, [Reviewed]
Inelastic neutron scattering on deuterated single-crystal samples is used to study Haldane-gap excitations in the new S=1 one-dimensional quantum antiferromagnet Ni(C5D14N2)(2)N-3(PF6), that was recently recognized as an ideal model system for high-field studies. The Haldane gap energies Delta (x)=0.42(3) meV, Delta (y) = 0.52(6) meV, and Delta (t) = 1.9(1) meV, for excitations polarized along the a, b, and c crystallographic axes, respectively, are measured. The dispersion relation is studied for momentum transfers both along and perpendicular to the chains' direction. The in-chain exchange constant J = 2.8 meV is found to be much larger than interchain coupling, J(y) = 1.8(4) x 10(-3) meV and J(x) = 4(3) x 10(-4) meV, along the b and a axes, respectively. The results are discussed in the context of future experiments in high magnetic fields.
AMER PHYSICAL SOC, English, Scientific journal
ISSN：1098-0121, eISSN：1550-235X, Web of Science ID：WOS:000167402100052 - Field-induced three- and two-dimensional freezing in a quantum spin liquid
Y Chen; Z Honda; A Zheludev; C Broholm; K Katsumata; SM Shapiro
PHYSICAL REVIEW LETTERS, Volume：86, Number：8, First page：1618, Last page：1621, Feb. 2001, [Reviewed]
Field-induced commensurate transverse magnetic ordering is observed in the Haldane-gap compound Ni(C5D14N2)(2)N-3(PF6) by means of neutron diffraction. Depending on the direction of applied field, the high-field phase is shown to be either a three-dimensional ordered Neel state or a short-range ordered state with dominant two-dimensional spin correlations. The structure of the high-field phase is determined, and properties of the observed quantum phase transition are discussed.
AMERICAN PHYSICAL SOC, English, Scientific journal
ISSN：0031-9007, Web of Science ID：WOS:000167010000056 - Field-induced long-range ordering in an S=1 quasi-one-dimensional Heisenberg antiferromagnet
Z Honda; K Katsumata; Y Nishiyama; Harada, I
PHYSICAL REVIEW B, Volume：63, Number：6, Feb. 2001, [Reviewed]
Detailed results of heat capacity and magnetization measurements are reported on a single crystal sample of the spin S=1 quasi-one-dimensional Heisenbrrg antiferromagnet Ni(C5H14N2)(2)N-3(PF6), abbreviated NDMAP. From these results, we constructed the magnetic field (H) versus temperature phase diagram of this compound which exhibits the quantum disordered Haldane, field-induced long-range-ordered (LRO) and thermally disordered paramagnetic phases. The phase boundary curve separating the paramagnetic and LRO phases is anisotropic; the increase of the Neel temperature (T-N) with H along the a and b axes is more rapid than that along the c axis. We calculated T-N as a function of H by taking into account the interchain coupling as the form of a mean held. The calculation of the staggered susceptibility of the S=1 one-dimensional antiferromagnet with an easy-plane anisotropy shows quite different behavior in the different field directions, resulting in the anisotropic phase boundary curve. A good agreement is obtained between theory and experiment using the exchange and anisotropy constants obtained from the neutron scattering experiment.
AMER PHYSICAL SOC, English, Scientific journal
ISSN：1098-0121, eISSN：1550-235X, Web of Science ID：WOS:000166911400059 - Electron spin resonance in the [formula omitted] quasi-one-dimensional Heisenberg antiferromagnet [formula omitted]
Z. Honda; K. Katsumata; M. Hagiwara; M. Tokunaga
Journal of Applied Physics, Volume：87, Number：9, First page：5896, Last page：5898, May 2000, [Reviewed]
We have performed electron spin resonance (ESR) measurements on the [formula omitted] quasi-one-dimensional Heisenberg antiferromagnet, [formula omitted] in the field induced long range ordered (LRO) phase. From the ESR experiments, two branches are observed, one of which is assigned to an antiferromagnetic resonance mode and the other to a one-dimensional excitation that persists in the LRO phase. © 2000, American Institute of Physics. All rights reserved.
English, International conference proceedings
DOI：https://doi.org/10.1063/1.372559
DOI ID：10.1063/1.372559, ISSN：1089-7550, SCOPUS ID：0039616340 - Electron spin resonance in the S=1 quasi-one-dimensional Heisenberg antiferromagnet Ni(C5H14N2)2N3(PF6)
Z. Honda; K. Katsumata; M. Hagiwara; M. Tokunaga
Journal of Applied Physics, May 2000, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1063/1.372559
DOI ID：10.1063/1.372559 - Coexistence of one- and three-dimensional excitations in a quasi-one-dimensional S=1 Heisenberg antiferromagnet
Z. Honda; K. Katsumata; M. Hagiwara; M. Tokunaga
Physical Review B, Oct. 1999, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1103/PhysRevB.60.9272
DOI ID：10.1103/PhysRevB.60.9272 - Phase transition of an S = 1 quasi-one-dimensional Heisenberg antiferromagnet in applied magnetic fields
Z Honda; K Katsumata
JOURNAL OF APPLIED PHYSICS, Volume：85, Number：8, First page：6076, Last page：6078, Apr. 1999, [Reviewed]
The phase transition of the S=1 quasi-one-dimensional Heisenberg antiferromagnet Ni(C5H14N2)(2)N-3(PF6) in an applied magnetic field (H) is studied from the measurement of the heat capacity (C-p). There is no anomaly in C-p below H=4 T (H parallel to the chain) or H=6 T (H perpendicular to the chain). A sharp anomaly in C-p is observed above H=4 T (H parallel to the chain) or H=6 T (H perpendicular to the chain) indicating the occurrence of long-range ordering. The H dependence of the critical temperature is studied and a temperature versus magnetic field phase diagram is constructed. (C) 1999 American Institute of Physics. [S0021-8979(99)28508-8].
AMER INST PHYSICS, English, Scientific journal
ISSN：0021-8979, Web of Science ID：WOS:000079853500260 - Field-induced magnetic long-range order in the ferromagnetic-antiferromagnetic alternating Heisenberg chain system (CH3)(2)CHNH3CuCl3 observed by specific heat measurements
H Manaka; Yamada, I; Z Honda; HA Katori; K Katsumata
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, Volume：67, Number：11, First page：3913, Last page：3917, Nov. 1998, [Reviewed]
The compound (CH3)(2)CHNH3CuCl3 has recently been found to be an ideal ferromagnetic-antiferromagnetic alternating Heisenberg chain with the energy gap Delta/k = 17 similar to 18K [H. Manaka et al.: J. Phys. Sec. Jpn. 66 (1997) 564]. When an external field H is applied to this compound, the energy gap should vanish at the critical field H-c1 = Delta/g mu(B). Just above H-c1, the three-dimensional magnetic long-range order is expected, if the interchain coupling exists. Motivated by this expectation, we performed specific heat measurements over a temperature range from 0.5 to 5 K applying H up to 12 T. As a result. we found a lambda-type anomaly of specific heat over 10 similar to 12T, which indicates a transition to the three-dimensional long range order. The temperature at which the lambda-type anomaly appears increases with increasing H. The critical field obtained by extrapolating the curve of the lambda peak position versus H is 9.0 T; which is close to that obtained from a magnetization measurement.
PHYSICAL SOC JAPAN, English, Scientific journal
ISSN：0031-9015, Web of Science ID：WOS:000077364800045 - Dimerized nickel(2+) chain compounds with nitro-nitrito bridges and unprecedented [Ln(NO3)(4)(CH3OH)(2)](-) anions (Ln = lanthanide). Crystal structure and magnetic properties
TM Rajendiran; O Kahn; S Golhen; L Ouahab; Z Honda; K Katsumata
INORGANIC CHEMISTRY, Volume：37, Number：21, First page：5693, Last page：+, Oct. 1998, [Reviewed]
The dimerization of the famous Haldane gap Ni2+ chain compound with nitro-nitrito bridges (abbreviated as NENP by the physicists) has been achieved by involving two monoanions in the structure. One of these anions, [Ln(NO3)(4)(CH3OH)(2)](-), with Ln = lanthanide element or Y, is unprecedented.
AMER CHEMICAL SOC, English, Scientific journal
ISSN：0020-1669, Web of Science ID：WOS:000076613700048 - Field-induced long-range-ordering in the S = 1 quasi-one-dimensional Heisenberg antiferromagnet Ni(C
5 H14 N2 )2 N3 (ClO4 )
K. Katsumata; Z. Honda; Z. Honda; H. Aruga Katori; T. Manabe; H. Shimizu; M. Yamashita
Journal of Magnetism and Magnetic Materials, Volume：177-181, First page：626, Last page：627, Jan. 1998
We have performed a heat capacity (Cp) measurement using a relaxation method on a single-crystal sample of the S = 1 quasi-one-dimensional Heisenberg antiferromagnet Ni(C5H14N2)2N3(ClO4) in high magnetic fields and at low temperatures. An anomaly in Cphas been observed at about 0.9 K and at 12 T. We interpret this anomaly as an indication of field induced long-range magnetic ordering. Q 1998 Elsevier Science B.V. All rights reserved.
DOI：https://doi.org/10.1016/S0304-8853(97)00982-7
DOI ID：10.1016/S0304-8853(97)00982-7, ISSN：0304-8853, SCOPUS ID：0031655686 - Magnetic Susceptibility of [Cu2(C2O4)(C10H8N2)2](NO3)2-a Candidate for a Spin Ladder Compound
Z. Honda; Y. Nonomura; K. Katsumata
Journal of the Physical Society of Japan, Volume：66, Number：11, First page：3689, Last page：3690, Nov. 1997, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.1143/JPSJ.66.3689
DOI ID：10.1143/JPSJ.66.3689 - S=1 new Haldane gap systems and spin glass behaviors: Syntheses, structures and magnetic properties of linear-chain Ni(II) complexes
T. Manabe; M. Yamashita; T. Ohishi; T. Takeuchi; T. Yosida; Y. Yu; Z. Honda; K. Katsumata
Synthetic Metals, Volume：85, First page：1717, Last page：1718, Mar. 1997
A series of compounds, [Ni(AA)2X]Y (AA=diamines, tetramines etc; X=N3and NO2; Y=C104, PF6etc) with S=1 have been synthesized, and their magnetic properties and crystal structures have been investigated. They have linear-chain structures. It has been found that the magnitude of the Haldane gaps can be controlled by substituting the bridging groups(X) and in-plane ligands(AA). On the other hand, [Ni([15]aneN4)N3]PF6, [Ni([14]aneN4)N3]ClO4·H2O and [Ni(en)2NO2]BF4show spin glass behaviors.
ISSN：0379-6779, SCOPUS ID：0031070605 - Inducing a magnetic ordering in the Haldane material Ni(C
5 H14 N2 )2 N3 (ClO4 ) by magnetic field
Z. Honda; Z. Honda; K. Katsumata; H. Aruga Katori; K. Yamada; T. Ohishi; T. Manabe; M. Yamashita
Journal of Physics Condensed Matter, Volume：9, Feb. 1997
From a heat capacity measurement in high magnetic fields and at low temperatures, we have obtained evidence for a magnetic ordering in the S = 1 quasi-one dimensional Heisenberg antiferromagnet Ni(C5H14N2)N3(ClO4). The transition temperature is ∼0.6 K at 12 T parallel to the chain axis.
DOI：https://doi.org/10.1088/0953-8984/9/7/003
DOI ID：10.1088/0953-8984/9/7/003, ISSN：0953-8984, SCOPUS ID：0003809865 - Crystal structure and magnetic properties of the S=1 quasi-one-dimensional compound Ni([15]aneN
4 )N3 (PF6 )
Yang Yu; Zentaro Honda; Koichi Katsumata; Tachi Ohishi; Toshio Manabe; Masahiro Yamashita
Molecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals, Volume：285-286, First page：121, Last page：126, Dec. 1996
A new S=1 quasi-one-dimensional compound Ni([15]aneN4)N3(PF6) (chemical formula NiC11N7H26PF6, in short NPAP) has been synthesized. Both crystal structure and magnetic properties of this compound have been characterized using the single crystal samples. NPAP crystallizes in the orthorhombic system, with space group P2nn (No.34), Z=2 and unit-cell parameters a=11.332(5)Å, b=13.861(4)Å and c=6.173(2)Å, respectively. The crystal structure was solved using direct method and the refinement converged at R(Rw)=0.062(0.062). A superlattice along the c-axis was conformed by both X-ray Weissenberg film and powder diffraction method. In addition, a disorder of the packing sequence of the ([15]aneN4) in-plane ligands along the c-axis was proposed. The temperature dependence of magnetization of a single crystal of NPAP was measured using a SQUID magnetometer. We have observed a large difference in zero field cooled and field cooled magnetizations below about 20K. We have also measured the AC susceptibility of this sample in zero static magnetic field. A cusp is observed at about 22K in the temperature dependence of AC susceptibility.
ISSN：1058-725X, SCOPUS ID：4243186183
- Pressure effects on the magnetic properties of the S = 1/2 two-leg ladder Cu(DEP)Cl2: II
森本大幹; 二本木克旭; 木田孝則; 鳴海康雄; 本多善太郎; 金道浩一; 萩原政幸
日本物理学会講演概要集(CD-ROM), Volume：78, Number：2, 2023
ISSN：2189-079X, J-Global ID：202302267278813872 - Pressure effects on the magnetic properties of the S=1/2 two-leg ladder Cu(DEP)Cl2
森本大幹; 木田孝則; 鳴海康雄; 本多善太郎; 金道浩一; 萩原政幸
日本物理学会講演概要集(CD-ROM), Volume：78, Number：1, 2023
ISSN：2189-079X, J-Global ID：202302268770309298 - Magnetism and exfoliation of organic-inorganic layered cobalt hydroxides
安田有智; 久下真人; 萩原政幸; 木田孝則; 本多善太郎
応用物理学会春季学術講演会講演予稿集(CD-ROM), Volume：70th, 2023
ISSN：2436-7613, J-Global ID：202302273722871460 - Simple synthesis, magnetic, and ion adsorption properties of carbon nitride with homogeneously dispersed metal ions
島津陸斗; 萩原政幸; 木田孝則; 栗原英紀; 本多善太郎
応用物理学会春季学術講演会講演予稿集(CD-ROM), Volume：70th, 2023
ISSN：2436-7613, J-Global ID：202302283137411812 - Magnetic properties and crystal structures of organic-inorganic layered cinnamo cobalt hydroxides
齋藤桂; 市村奏絵; 安田有智; 木田孝則; 萩原政幸; 本多善太郎
日本磁気学会学術講演概要集, Volume：45th, 2021
ISSN：1882-2959, J-Global ID：202102265134064333 - Synthesis and magnetic properties of phthalocyanine based metal-organic frameworks
井上大樹; 中嶋桃子; 萩原政幸; 木田孝則; 本多善太郎
応用物理学会秋季学術講演会講演予稿集(CD-ROM), Volume：82nd, 2021
J-Global ID：202202215087349347 - Structure and magnetic properties of porous phthalocyanine sheet polymers
古屋輝人; 島津陸斗; 萩原政幸; 木田孝則; 本多善太郎
応用物理学会秋季学術講演会講演予稿集(CD-ROM), Volume：82nd, 2021
J-Global ID：202202247337230546 - Synthesis and magnetic properties of transition metal hemiporphyrazine based linear chain polymeric carbon nitrides
伊藤悠利; 神保直永; 萩原政幸; 木田孝則; 本多善太郎
応用物理学会秋季学術講演会講演予稿集(CD-ROM), Volume：82nd, 2021
J-Global ID：202202290922934274 - High-field magnetism of the S=1/2 spin-ladder material Cu(DEP)Br2 under pressure
森川悦司; 二本木克旭; 木田孝則; 本多善太郎; 鳴海康雄; 金道浩一; 萩原政幸
日本物理学会講演概要集(CD-ROM), Volume：76, Number：2, 2021
ISSN：2189-079X, J-Global ID：202202285800085973 - Magnetic properties of layered copper and cobalt cinnamate complexes
市村奏絵; 藤原隆司; 木田孝則; 萩原政幸; 鎌田憲彦; 本多善太郎
日本磁気学会学術講演概要集, Volume：44th, 2020
ISSN：1882-2959, J-Global ID：202102250230299548 - Magnetism of phthalocyanine based metal organic frameworks
井上大樹; 萩原政幸; 木田孝則; 鎌田憲彦; 本多善太郎
応用物理学会秋季学術講演会講演予稿集(CD-ROM), Volume：81st, 2020
J-Global ID：202102285580088934 - Synthesis and magnetic properties of phthalocyanine-metal composites
古屋輝人; 萩原政幸; 木田孝則; 鎌田憲彦; 本多善太郎
応用物理学会秋季学術講演会講演予稿集(CD-ROM), Volume：81st, 2020
J-Global ID：202102291523033379 - リチウムを挿入した多孔質鉄化合物の磁性
藤田恵理子; 萩原政幸; 木田孝則; 澤田祐也; 鎌田憲彦; 本多善太郎
応用物理学会春季学術講演会講演予稿集(CD-ROM), Volume：66th, First page：ROMBUNNO.10a‐S423‐7, 25 Feb. 2019
Japanese
J-Global ID：201902259444785524 - コバルトフタロシアニンシートの合成と構造
大倉秀亮; 萩原政幸; 木田孝則; 澤田祐也; 鎌田憲彦; 本多善太郎
応用物理学会春季学術講演会講演予稿集(CD-ROM), Volume：66th, First page：ROMBUNNO.10a‐S423‐6, 25 Feb. 2019
Japanese
J-Global ID：201902282433146209 - Mnドープポリトリアジンイミドシートのボトムアップ合成と磁性
斉藤優斗; 竹中文人; 萩原政幸; 木田孝則; 澤田祐也; 鎌田憲彦; 本多善太郎
応用物理学会秋季学術講演会講演予稿集(CD-ROM), Volume：79th, First page：ROMBUNNO.19p‐437‐13, 05 Sep. 2018
Japanese
J-Global ID：201802249846091794 - H2Oを架橋配位子とする1次元構造金属錯体の磁性
野本尚之; 藤原隆司; 澤田祐也; 木田孝則; 萩原政幸; 鎌田憲彦; 本多善太郎
日本磁気学会学術講演概要集, Volume：42nd, First page：124, 28 Aug. 2018
Japanese
ISSN：1882-2959, J-Global ID：201802236748914308 - Pt触媒を用いて作製した水素吸蔵体YbH2の光学特性評価
吉澤輝; 酒井政道; 本多善太郎; 中村修
応用物理学会春季学術講演会講演予稿集(CD-ROM), Volume：65th, First page：ROMBUNNO.18a‐P5‐9, 05 Mar. 2018
Japanese
J-Global ID：201802254431386647 - Investigation of Honeycomb Lattice Consisting of Cu-2(pymca)(3) Moieties Using Synchrotron Radiation X-ray Structure Analysis
Kento Sugawara; Kunihisa Sugimoto; Naoyuki Katayama; Masayuki Hagiwara; Zentaro Honda; Hiroshi Sawa
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, Volume：86, Number：12, Dec. 2017
We present structural studies of the spin-1/2 honeycomb-lattice antiferromagnet, Cu-2(pymca)(3)(ClO4) (pymca: pyrimidine-2-carboxylate), using synchrotron X-ray diffraction experiments. Previous research reported that its crystal structure consists of a regular honeycomb lattice, which exhibits quantum spin-liquid behavior. However, due to its threefold Cu2+ site symmetry, this proposed crystal structure cannot describe Jahn-Teller distortion. We analyzed the structure of Cu-2(pymca)(3)(ClO4), including superlattice reflections that were overlooked during previous X-ray diffraction studies of the material, and clarified that its distorted honeycomb lattice consists of Cu-2(pymca)(3) sections. Further investigation of Cu-2(pymca)(3)(ClO4) crystal structure may reveal magnetic susceptibilities of the distorted honeycomb lattice.
PHYSICAL SOC JAPAN, English
DOI：https://doi.org/10.7566/JPSJ.86.123302
DOI ID：10.7566/JPSJ.86.123302, ISSN：0031-9015, SCOPUS ID：85039865624, Web of Science ID：WOS:000416919700002 - ギ酸ペロブスカイト[CH3NH3)[M(HCOO)3],(M=Mn,Co,Ni,Cu)の磁性と構造
佐藤大輔; 木田孝則; 萩原政幸; 福田武司; 鎌田憲彦; 本多善太郎
日本磁気学会学術講演概要集, Volume：41st, First page：16, 05 Sep. 2017
Japanese
ISSN：1882-2959, J-Global ID：201702233654434401 - ピリミジンカルボン酸架橋ハニカム金属錯体の磁性
海津敏裕; 奥谷顕; 木田孝則; 萩原政幸; 福田武司; 鎌田憲彦; 本多善太郎
日本磁気学会学術講演概要集, Volume：41st, First page：17, 05 Sep. 2017
Japanese
ISSN：1882-2959, J-Global ID：201702256680401417 - 放射光X線回折によるスピン1/2ハニカム格子系Cu2(pymca)3(ClO4)の構造解析
菅原健人; 片山尚幸; 奥谷顕; 木田孝則; 鳴海康雄; 萩原政幸; 本多善太郎; 佐賀山基; 熊井玲児; 澤博
日本物理学会講演概要集(CD-ROM), Volume：72, Number：1, First page：ROMBUNNO.17pC36‐8, Last page：1076, 21 Mar. 2017Cu_2_(pymca)_3_(ClO_4_)はスピン1/2を持つCu^2+^がハニカム格子を形成し、量子スピン液体状態が期待されていた。既報の構造解析の結果ではこのハニカム格子は厳密な正六角形をとり、Cu^2+^のeg軌道軌道の縮退が示唆されていたが、磁性等の物理データと整合しない点があり、正確な結晶構造を得るため、PFでの放射光X線回折実験を行った。。本講演では、既報の放射光X線回折実験によって求まった結晶構造について発表する。この構造は既報の構造と異なっている部分があり、そのことによりハニカム格子およびCu^2+^の取りうる電子状態がどのように変化するか発表する予定である。
The Physical Society of Japan, Japanese
DOI：https://doi.org/10.11316/jpsgaiyo.72.1.0_1076
DOI ID：10.11316/jpsgaiyo.72.1.0_1076, ISSN：2189-079X, J-Global ID：201702245007211541, CiNii Articles ID：130006708799 - スピン1/2ハニカム格子反強磁性体Cu2(pymca)3(ClO4)の強磁場磁化過程
奥谷顕; 木田孝則; 鳴海康雄; 下川統久朗; 菅原健人; 片山尚幸; 澤博; 本多善太郎; 萩原政幸
日本物理学会講演概要集(CD-ROM), Volume：72, Number：1, First page：ROMBUNNO.17pC36‐9, 21 Mar. 2017
Japanese
ISSN：2189-079X, J-Global ID：201702274664029402 - 遷移金属をドープした磁性炭素材料のボトムアップ合成と磁性
菊池智史; 桑原諒介; 萩原政幸; 木田孝則; 酒井政道; 福田武司; 鎌田憲彦; 本多善太郎
応用物理学会春季学術講演会講演予稿集(CD-ROM), Volume：64th, First page：ROMBUNNO.15p‐514‐6, 01 Mar. 2017
Japanese
J-Global ID：201702220753696571 - 電子顕微鏡によるフタロシアニンシートの直接観察
田代慎; 坂口裕哉; 萩原政幸; 木田孝則; 酒井政道; 福田武司; 鎌田憲彦; 本多善太郎
応用物理学会春季学術講演会講演予稿集(CD-ROM), Volume：64th, First page：ROMBUNNO.15p‐514‐5, 01 Mar. 2017
Japanese
J-Global ID：201702282799203905 - ハニカム格子反強磁性体M2(pymca)3(ClO4)(M=Cu,Ni,Co,Fe)の強磁場磁性
奥谷顕; 木田孝則; 本多善太郎; 萩原政幸
日本物理学会講演概要集(CD-ROM), Volume：71, Number：2, First page：ROMBUNNO.13aPS‐83, 23 Sep. 2016
Japanese
ISSN：2189-079X, J-Global ID：201602254985233446 - 窒素ドープ炭素材料のボトムアップ合成と磁性
菊池智史; 坂口裕哉; 桑原諒介; 萩原政幸; 木田孝則; 酒井政道; 福田武司; 鎌田憲彦; 本多善太郎
応用物理学会秋季学術講演会講演予稿集(CD-ROM), Volume：77th, First page：ROMBUNNO.13p‐A25‐5, 01 Sep. 2016
Japanese
J-Global ID：201602211568503079 - フタロシアニンシートポリマーの合成,構造と磁性
田代慎; 坂口裕哉; 萩原政幸; 木田孝則; 酒井政道; 福田武司; 鎌田憲彦; 本多善太郎
応用物理学会秋季学術講演会講演予稿集(CD-ROM), Volume：77th, First page：ROMBUNNO.13p‐A25‐6, 01 Sep. 2016
Japanese
J-Global ID：201602234660580680 - シュウ酸類架橋ハニカム配位高分子の磁性
LIN Q; 児玉貴文; 奥谷顕; 木田孝則; 萩原政幸; 福田武司; 鎌田憲彦; 本多善太郎
日本磁気学会学術講演概要集, Volume：40th, First page：315, 22 Aug. 2016
Japanese
ISSN：1882-2959, J-Global ID：201602231360598072 - 有機無機層状遷移金属水酸化物M2(OH)2(TPA),(M=Fe,Co,Ni,Cu)の磁性と構造
穴井克樹; 木田孝則; 萩原政幸; 福田武司; 鎌田憲彦; 本多善太郎
日本磁気学会学術講演概要集, Volume：40th, First page：314, 22 Aug. 2016
Japanese
ISSN：1882-2959, J-Global ID：201602246110175897 - S=1/2ハニカム格子反強磁性体Cu2(pymca)3(ClO4)の強磁場磁性
奥谷顕; 木田孝則; 本多善太郎; 下川統久朗; 萩原政幸
日本物理学会講演概要集(CD-ROM), Volume：71, Number：1, First page：ROMBUNNO.19APS‐52, 22 Mar. 2016
Japanese
ISSN：2189-079X, J-Global ID：201602280351455186 - 4H‐SiC基板の二波長励起PL測定―BGE強度依存性―
近藤圭太郎; 福田武司; 本多善太郎; 鎌田憲彦; 八木修平; 矢口裕之
応用物理学会春季学術講演会講演予稿集(CD-ROM), Volume：63rd, First page：ROMBUNNO.20A-H101-9, 03 Mar. 2016
Japanese
J-Global ID：201602220555984119 - 金属フタロシアニンを用いた遷移金属ドープ炭素材料の合成と磁性
佐藤峻; 金杉彩能; 萩原政幸; 木田孝則; 酒井政道; 福田武司; 鎌田憲彦; 本多善太郎
応用物理学会春季学術講演会講演予稿集(CD-ROM), Volume：63rd, First page：ROMBUNNO.20P-S323-10, 03 Mar. 2016
Japanese
J-Global ID：201602209500256994 - シアノフタロシアニンをビルディングブロックとしたポリフタロシアニンシートの合成
坂口裕哉; 田代慎; 萩原政幸; 木田孝則; 酒井政道; 福田武司; 鎌田憲彦; 本多善太郎
応用物理学会春季学術講演会講演予稿集(CD-ROM), Volume：63rd, First page：ROMBUNNO.20P-S323-9, 03 Mar. 2016
Japanese
J-Global ID：201602219945811683 - 均一構造銅ポリフタロシアニンの合成と磁性
坂口裕哉; 田代慎; 萩原政幸; 木田孝則; 酒井政道; 福田武司; 鎌田憲彦; 本多善太郎
応用物理学会秋季学術講演会講演予稿集(CD-ROM), Volume：76th, First page：ROMBUNNO.13A-2R-1, 31 Aug. 2015
Japanese
J-Global ID：201502212723896417 - 金属フタロシアニン基炭素材料の合成と磁性
佐藤峻; 金杉彩能; 萩原政幸; 木田孝則; 酒井政道; 福田武司; 鎌田憲彦; 本多善太郎
応用物理学会秋季学術講演会講演予稿集(CD-ROM), Volume：76th, First page：ROMBUNNO.13A-2R-2, 31 Aug. 2015
Japanese
J-Global ID：201502220683536504 - S=2ハイゼンベルグ反強磁性鎖MnCl3(bpy)単結晶の強磁場磁性
篠崎真一; 池田真実; 奥谷顕; 吉澤大智; 木田孝則; 萩原政幸; 竹内徹也; 本多善太郎; RISSET O; TALHAM D. R; MEISEL M
日本物理学会講演概要集(CD-ROM), Volume：70, Number：1, First page：ROMBUNNO.21PPSA-50, 24 Mar. 2015
Japanese
ISSN：2189-079X, J-Global ID：201502207216346916 - 金属フタロシアニンを基にした磁性炭素材料の合成と磁性
佐藤峻; 武藤祐太; 萩原政幸; 木田孝則; 酒井政道; 福田武司; 鎌田憲彦; 本多善太郎
応用物理学会春季学術講演会講演予稿集(CD-ROM), Volume：62nd, First page：ROMBUNNO.11P-A20-9, 26 Feb. 2015
Japanese
J-Global ID：201502231646491810 - 高保磁力層状コバルト水酸化物の磁性と構造
穴井克樹; 中村哲也; 萩原政幸; 木田孝則; 奥谷顕; 香取浩子; 太田寛人; 酒井政道; 福田武司; 鎌田憲彦; 本多善太郎
応用物理学会春季学術講演会講演予稿集(CD-ROM), Volume：62nd, First page：ROMBUNNO.11P-A20-8, 26 Feb. 2015
Japanese
J-Global ID：201502296034105966 - High-Field ESR Measurements of the Spin-Gap System in Polarized Microwaves
S. Kimura; K. Watanabe; T. Kashiwagi; H. Yamaguchi; M. Hagiwara; Z. Honda
Applied Magnetic Resonance, Volume：46, First page：1035, Last page：1039, 2015
DOI：https://doi.org/10.1007/s00723-015-0661-8
DOI ID：10.1007/s00723-015-0661-8 - 鉄フタロシアニンを基にした磁性炭素材料の合成と磁性
武藤祐太; 佐藤峻; 萩原政幸; 木田孝則; 酒井政道; 福田武司; 鎌田憲彦; 本多善太郎
応用物理学会秋季学術講演会講演予稿集(CD-ROM), Volume：75th, First page：ROMBUNNO.19P-A6-7, 01 Sep. 2014
Japanese
J-Global ID：201402201478754865 - 酸素分子を吸着したナノポーラス配位高分子の磁性
児玉貴文; 菊川玲於; 萩原政幸; 木田孝則; 酒井政道; 福田武司; 鎌田憲彦; 本多善太郎
応用物理学会秋季学術講演会講演予稿集(CD-ROM), Volume：75th, First page：ROMBUNNO.19P-A6-6, 01 Sep. 2014
Japanese
J-Global ID：201402230480604943 - 7aPS-90 High-field magnetism of the layered cobalt compounds Co_2(OH)_2(X)(X=TPA, NDCA, SDCA)
Okutani A.; Honda Z.; Katori H.; Ohta H.; Hagiwara M.
Meeting abstracts of the Physical Society of Japan, Volume：69, Number：2, First page：252, Last page：252, 22 Aug. 2014
The Physical Society of Japan (JPS), Japanese
ISSN：1342-8349, CiNii Articles ID：110009887101, CiNii Books ID：AA11439205 - 8aBJ-7 High field ESR measurements of the anitiferromagnetic Co dimer using polarized light
Kimura S.; Watanabe K.; Kashiwagi T.; Yamaguchi H.; Hagiwara M.; Honda Z.
Meeting abstracts of the Physical Society of Japan, Volume：69, Number：2, First page：353, Last page：353, 22 Aug. 2014
The Physical Society of Japan (JPS), Japanese
ISSN：1342-8349, CiNii Articles ID：110009887469, CiNii Books ID：AA11439205 - Improved energy transfer from semiconductor quantum dot to organic dye using column separation technique
KURABAYASHI Tomokazu; FUNAKI Nayuta; FUKUDA Takeshi; HONDA Zentaro; KAMATA Norihiko; SUZUKI Miho
IEICE technical report. EMD, Volume：114, Number：94, First page：1, Last page：4, 20 Jun. 2014
Since a intracellular pH is an important bioactive factor, a detection method has been required. We investigated a FRET(Fluorescence Resonance Energy Transfer)-based pH sensor conjugated with a CdSe/ZnS quantum dot and a fluorescent organic dye. In this paper, we estimated a fluorescence spectrum of the CdSe/ZnS-dye mixed aqueous solution, and this reaction is found to continue up to 30 min by measuring fluorescence spectral change. However, a most serious problem is that unreacted raw materials cause the low sensitivity of the pH sensor. Wherein, we attempted to fractionate the reactant by using a gel filtration column due to different velocities of the CdSe/ZnS quantum dot and the fluorescent dye. This result shows that the unreacted CdSe/ZnS quantum dot phosphor and fluorescent dye can be successfully removed through the the column, and the different numbers of fluorescence dye around the CdSe/ZnS quantum dot can be realized. Finally, we succeeded in fabricating the sensitivity of the high pH sensor. In addition, we confirmed to respond pH by using a part of the separated pH sensor exchanged buffer by the ultrafiltration.
The Institute of Electronics, Information and Communication Engineers, Japanese
ISSN：0913-5685, CiNii Articles ID：110009925286, CiNii Books ID：AN10383978 - Improved energy transfer from semiconductor quantum dot to organic dye using column separation technique
KURABAYASHI Tomokazu; FUNAKI Nayuta; FUKUDA Takeshi; HONDA Zentaro; KAMATA Norihiko; SUZUKI Miho
IEICE technical report. Component parts and materials, Volume：114, Number：95, First page：1, Last page：4, 20 Jun. 2014
Since a intracellular pH is an important bioactive factor, a detection method has been required. We investigated a FRET(Fluorescence Resonance Energy Transfer)-based pH sensor conjugated with a CdSe/ZnS quantum dot and a fluorescent organic dye. In this paper, we estimated a fluorescence spectrum of the CdSe/ZnS-dye mixed aqueous solution, and this reaction is found to continue up to 30 min by measuring fluorescence spectral change. However, a most serious problem is that unreacted raw materials cause the low sensitivity of the pH sensor. Wherein, we attempted to fractionate the reactant by using a gel filtration column due to different velocities of the CdSe/ZnS quantum dot and the fluorescent dye. This result shows that the unreacted CdSe/ZnS quantum dot phosphor and fluorescent dye can be successfully removed through the the column, and the different numbers of fluorescence dye around the CdSe/ZnS quantum dot can be realized. Finally, we succeeded in fabricating the sensitivity of the high pH sensor. In addition, we confirmed to respond pH by using a part of the separated pH sensor exchanged buffer by the ultrafiltration.
The Institute of Electronics, Information and Communication Engineers, Japanese
ISSN：0913-5685, CiNii Articles ID：110009925205, CiNii Books ID：AN10012932 - Improved energy transfer from semiconductor quantum dot to organic dye using column separation technique
KURABAYASHI Tomokazu; FUNAKI Nayuta; FUKUDA Takeshi; HONDA Zentaro; KAMATA Norihiko; SUZUKI Miho
Technical report of IEICE. OME, Volume：114, Number：96, First page：1, Last page：4, 20 Jun. 2014
Since a intracellular pH is an important bioactive factor, a detection method has been required. We investigated a FRET(Fluorescence Resonance Energy Transfer)-based pH sensor conjugated with a CdSe/ZnS quantum dot and a fluorescent organic dye. In this paper, we estimated a fluorescence spectrum of the CdSe/ZnS-dye mixed aqueous solution, and this reaction is found to continue up to 30 min by measuring fluorescence spectral change. However, a most serious problem is that unreacted raw materials cause the low sensitivity of the pH sensor. Wherein, we attempted to fractionate the reactant by using a gel filtration column due to different velocities of the CdSe/ZnS quantum dot and the fluorescent dye. This result shows that the unreacted CdSe/ZnS quantum dot phosphor and fluorescent dye can be successfully removed through the the column, and the different numbers of fluorescence dye around the CdSe/ZnS quantum dot can be realized. Finally, we succeeded in fabricating the sensitivity of the high pH sensor. In addition, we confirmed to respond pH by using a part of the separated pH sensor exchanged buffer by the ultrafiltration.
The Institute of Electronics, Information and Communication Engineers, Japanese
ISSN：0913-5685, CiNii Articles ID：110009925227, CiNii Books ID：AN10013334 - Size-Controlled ZnO Nano Fiber Fabricated by Electrospinning Method and Its Applications for Organic Photovoltaic Cells
FUKUDA Takeshi; LIAO Yingjie; KAMATA Norihiko; HONDA Zentaro
Technical report of IEICE. OME, Volume：113, Number：461, First page：29, Last page：32, 04 Mar. 2014
Zinc oxide nano-fibers with the high-carrier mobility have been required for inverted organic photovoltaic cells, and they were formed between the transparent anode and the organic active layer. Therefore, many previous papers demonstrated that the zinc oxide nano-fiber can be formed by the electrospinning method using the precursor solution of sol-gel processes. However, the controllability of the fiber size is not satisfied for practical applications of inverted organic photovoltaic cells. In this research, we investigated the molar concentration of precursor solution and the additive amount of PVP to control the diameter of the zinc oxide nano-fiber. As a result, the diameter decreased with decreasing molar concentration of the precursor solution and additive amount of PVP. The minimum diameter of 30 run was achieved at the PVP concentration of 0.06 g/ml, and the photoconversion efficiency of the inverted organic photovoltaic cell became 2.31% under the irradiation of AM1.5 light.
The Institute of Electronics, Information and Communication Engineers, Japanese
ISSN：0913-5685, CiNii Articles ID：110009862176, CiNii Books ID：AN10013334 - シアノベンゼンの固相反応による金属窒化物‐炭素複合材料の合成
本多善太郎; 阿部丈郎; 小原充瑛; 萩原政幸; 木田孝則; 酒井政道; 福田武司; 鎌田憲彦
応用物理学会春季学術講演会講演予稿集(CD-ROM), Volume：61st, First page：ROMBUNNO.17P-F10-2, 03 Mar. 2014
Japanese
J-Global ID：201402272205681860 - Multilayer Organic Light-Emitting Diode Fabricated by Ultrasonic Atomization Method
SATO Arata; FUKUDA Takeshi; KAMATA Norihiko; HONDA Zentro; YOSHITOMI Teruo
IEICE technical report. Electronic information displays, Volume：113, Number：408, First page：109, Last page：112, 24 Jan. 2014
Nowadays, our research group investigated a wet process, called as an electrospray deposition method. However, the deposition rate of this method is relatively low compared to conventional solution processes and the multilayer structure is difficult to be fabricated by this method. To solve the above mentioned problem, we investigated the ultrasonic atomization process and the substrate heating technique. In this work, we succeeded in the smooth surface roughness of TFB and F8BT films by controlling the substrate temperature. In addition, an organic light-emitting diode was demonstrated and the maximum luminance of 7,590 cd/m^2 and the current efficiency of 4.39 cd/A were achieved.
The Institute of Electronics, Information and Communication Engineers, Japanese
ISSN：0913-5685, CiNii Articles ID：110009825449, CiNii Books ID：AN10060775 - フタロシアニンを基にした磁性材料の合成
本多善太郎; 武藤祐太; 小原充瑛; 萩原政幸; 木田孝則; 酒井政道; 福田武司; 鎌田憲彦
応用物理学会秋季学術講演会講演予稿集(CD-ROM), Volume：74th, First page：ROMBUNNO.19P-C11-15, 31 Aug. 2013
Japanese
J-Global ID：201302232187331989 - 遷移金属フタロシアニン重合体における秩序磁性 II
本多善太郎; 吉田賢広; 小原充瑛; 武藤祐太; 萩原政幸; 木田孝則; 酒井政道; 福田武司; 鎌田憲彦
応用物理学会春季学術講演会講演予稿集(CD-ROM), Volume：60th, First page：ROMBUNNO.27P-B8-4, 11 Mar. 2013
Japanese
J-Global ID：201302230279743113 - Synthesis and Photoluminescence Characterization of (Zn_<1-x>M_x)_3V_2O_8 Phosphors (M=Mn, CO)
LI Tingting; HONDA Zentaro; FUKUDA Takeshi; LUO Jiaolian; KAMATA Norihiko
IEICE technical report. Electronic information displays, Volume：112, Number：409, First page：33, Last page：36, 24 Jan. 2013
We have succeeded in fabricating pure Zn_3V_2O_8 phase suitable for broad light emission by sol-gel process with zinc acetate dehydrate (Zn(CH_3COOO)_2.・2H_2O) and ammonium metavanadate (NH_4VO_3) as starting materials. Measurements of X-ray diffraction (XRD), scanning electron microscope, photoluminescence (PL) and PL quantum yield (PL-QY) have been carved out for the characterization of crystallographic and light emission properties As a result, the PL-QY is determined by both the crystalline phase purity (CP) of the Zn_3V_2O_8 phase defined by XRD patterns and the crystalline size. With optimizing the process condition at a slightly Zn-rich side, a pure Zn3V2O8 phase with enough large crystalline size was obtained. The PL-QY value reached to 52%, which was higher than our previously obtained value by solid state reaction. The effect of incorporating transition metals on the emission spectrum was measured in case of Mn and Co. A possibility of Zn_3V_2O_8 as a possible phosphor material for while light application is presented.
The Institute of Electronics, Information and Communication Engineers, Japanese
ISSN：0913-5685, CiNii Articles ID：110009728096, CiNii Books ID：AN10060775 - 遷移金属フタロシアニン重合体における秩序磁性
本多善太郎; 小原充瑛; 武藤祐太; 吉田賢広; 萩原政幸; 木田孝則; 酒井政道; 福田武司; 鎌田憲彦
応用物理学会学術講演会講演予稿集(CD-ROM), Volume：73rd, First page：ROMBUNNO.13A-C8-6, 27 Aug. 2012
Japanese
J-Global ID：201202269440586305 - 19aCD-6 ESR of S=1/2 2D square lattice antiferromagnet
Ikeda M.; Honda Z.; Fukuda T.; Kamata N.; Hagiwara M.
Meeting abstracts of the Physical Society of Japan, Volume：67, Number：2, First page：415, Last page：415, 24 Aug. 2012
The Physical Society of Japan (JPS), Japanese
ISSN：1342-8349, CiNii Articles ID：110009599984, CiNii Books ID：AA11439205 - 18aPSA-46 Alternative Ising-Heisenberg spins in magnetic field aligned bimetallic chain compounds investigated by high field magnetization
Han Y; Strecka Jozef; Kida T; Ikeda M; Honda Z; Hagiwara M
Meeting abstracts of the Physical Society of Japan, Volume：67, Number：2, 24 Aug. 2012
The Physical Society of Japan (JPS), English
ISSN：1342-8349, CiNii Articles ID：110009599875 - Organic light-emitting diode with chromatography-separated coal-pitch as emitting layer
KIMURA Sho; YAMAOKA Miki; ASAMI Shun-suke; FUKUDA Takeshi; HONDA Zentaro; KAMATA Norihiko; YAMASHITA Makoto
Technical report of IEICE. OME, Volume：112, Number：57, First page：31, Last page：34, 17 May 2012
By removal of coal gas, light oils, and volatiles (naphthalene and similar small polycyclic aromatic hydrocarbons) from coal tar, a black and tarry residue can be obtained as "coal-pitch" in 5-10% weight of consumed coal. Therefore, the usage of coal-pitch for several organic devices will lead the environmental-friendly and drastically cheap fabrication process of organic molecules compared to the conventional chemical synthesis. In this study, we investigated an organic light-emitting diode with coal-pitch solutions dissolved by different organic solvents as an emitting layer. The photoluminescence spectrum of coal-pitch solution changed from 429 nm to 550 nm by changing the solvent, and the highest luminance was 22.4 cd/m^2 at 24 V when tetrahydrofuran was used. In addition, we can separate the tetrahydrofuran-dissolved coal-pitch solution by using the preparative thin layer chromatography. As a result, the maximum luminance of 22.4 cd/m^2 was achieved at the applied voltage of 16 V. This result shows that high-device performance will be realized by the further separation process of coal-pitch solution and the optimized device structure.
The Institute of Electronics, Information and Communication Engineers, Japanese
ISSN：0913-5685, CiNii Articles ID：110009569590, CiNii Books ID：AN10013334 - CS-5-6 Color-Selective Organic Photoconductive Device for Image-Sensing Application
Fukuda Takeshi; Kimura Sho; Honda Zentaro; Kamata Norihiko; Mori Keita; Hatano Ken
Proceedings of the IEICE General Conference, Volume：2012, Number：2, First page："S, Last page：23"-"S-24", 06 Mar. 2012
The Institute of Electronics, Information and Communication Engineers, Japanese
CiNii Articles ID：110009459439, CiNii Books ID：AN10471452 - 24aPS-86 High-field Multi-frequency ESR in the S=1/2 frustrated chain compound LiCuVO_4
Fujita T.; Hagiwara M.; Yamaguchi H.; Kimura S.; Svistov L. E.; Smironov A. I.; Prokofiev A.; Honda Z.
Meeting abstracts of the Physical Society of Japan, Volume：67, Number：1, First page：495, Last page：495, 05 Mar. 2012
The Physical Society of Japan (JPS), Japanese
ISSN：1342-8349, CiNii Articles ID：110009566638, CiNii Books ID：AA11439205 - マンガンフタロシアニン重合体における室温強磁性
本多善太郎; 坪谷和彦; 萩原政幸; 木田孝則; 酒井政道; 福田武司; 鎌田憲彦
応用物理学関係連合講演会講演予稿集(CD-ROM), Volume：59th, First page：ROMBUNNO.18A-B3-5, 29 Feb. 2012
Japanese
J-Global ID：201202203468463755 - Sintering condition and optical propertied of Zn3V2O8 phosphor
Tingting Li; Jiaolian Luo; Z. Honda; T. Fukuda; N. Kamata
Volume：Vol.2, No.3, First page：173, Last page：177, 2012
DOI：https://doi.org/10.4236/ampc.2012.230236
DOI ID：10.4236/ampc.2012.230236 - High-efficiency blue-sensitive organic photoconductive device by doping silole derivative
KIMURA Sho; FUKUDA Takeshi; HONDA Zentaro; KAMATA Norihiko; MORI Keita; HATANO Ken
Technical report of IEICE. OME, Volume：111, Number：369, First page：7, Last page：10, 21 Dec. 2011
An organic image sensor has expected for a future sensing device owing to the small size and the high resolution. The organic image sensor consists of three organic photoconductive devices with the selective absorption band at three primary colors, respectively. By now, we have investigated an organic photoconductive device fabricated by a spin-coating process. In this study, we researched the relationship between the HOMO level of silole derivative and the performance of the blue-sensitive organic photoconductive device with F8BT as a blue-sensitive material and silole derivative as a dopant. As a result, the external quantum efficiency (EQE) and the S/N increased by doping silole derivative with lower HOMO level than F8BT. This result indicates that an improved device performance was attributed to the high-charge separation efficiency in the photoconductive layer by removing holes from F8BT to silole. We also investigated the influence of the doping concentration of NPh_3-silole on the device characteristics, the highest EQE of 52 % and S/N of 4.3×10^4 were realized at the doping concentration of 50 wt%.
The Institute of Electronics, Information and Communication Engineers, Japanese
ISSN：0913-5685, CiNii Articles ID：110009466885, CiNii Books ID：AN10013334 - 21pGM-5 Magnetic properties of the weakly coupled spin chains compound Cu(diazine)X_2, (X=Cl, Br)
Honda Z.; Fukuda T.; Kamata N.; Aruga Katori H.; Hagiwara M.
Meeting abstracts of the Physical Society of Japan, Volume：66, Number：2, First page：407, Last page：407, 24 Aug. 2011
The Physical Society of Japan (JPS), Japanese
ISSN：1342-8349, CiNii Articles ID：110008758744, CiNii Books ID：AA11439205 - 両極性伝導体におけるホール効果とスピン流 II
酒井政道; 本多善太郎; 長谷川繁彦; 北島彰; 大島明博; 樋口宏二; 中村修
応用物理学会学術講演会講演予稿集(CD-ROM), Volume：72nd, First page：ROMBUNNO.31A-ZS-10, 16 Aug. 2011
Japanese
J-Global ID：201102296097369077 - Improved surface roughness of organic thin film fabricated by electrospray deposition technique and its application to organic photovoltaic cell
TAKAGI KENJI; ASANO TAKASHI; FUKUDA TAKESHI; HONDA ZENTARO; KAMATA NORIHIKO; JU JUNGMYOUNG; YAMAGATA YUTAKA; AOYAMA TETSUYA; TAJIMA YUSUKE
電子情報通信学会技術研究報告, Volume：111, Number：73(OME2011 14-21), First page：31, Last page：34, 20 May 2011
Japanese
ISSN：0913-5685, J-Global ID：201102287948700643 - 両極性伝導体におけるホール効果とスピン流
酒井政道; 本多善太郎; 長谷川繁彦; 北島彰; 大島明博; 樋口宏二; 中村修
応用物理学関係連合講演会講演予稿集(CD-ROM), Volume：58th, First page：ROMBUNNO.24A-P1-5, 09 Mar. 2011
Japanese
J-Global ID：201102221256371355 - Solution-Processed Organic Light-Emitting Diode Fabricated by Electrospray Deposition Method with Additional Solvent
Takeshi Fukuda; Hirotaka Asaki; Takashi Asano; Kenji Takagi; Zentaro Honda; Norihiko Kamata; Tetsuya Aoyama; Jungmyoung Ju; Yutaka Yamagata
IDW'11: PROCEEDINGS OF THE 18TH INTERNATIONAL DISPLAY WORKSHOPS, VOLS 1-3, Volume：2, First page：849, Last page：852, 2011
We demonstrated the smooth surface roughness of the poly[9,9-dioctylfluorenyl-2,7-diyl]-co-1,4-benzo-(2,1,3)-thiadiazole (F8BT) thin film fabricated by the electrospray deposition technique. The root mean square roughness of the F8BT thin film was reduced by the addition of dimethyl sulfoxide in tetrahydrofuran. Furthermore, the organic light-emitting diode was also demonstrated by this method.
INST IMAGE INFORMATION & TELEVISION ENGINEERS, English
ISSN：1883-2490, SCOPUS ID：84870692226, Web of Science ID：WOS:000393147800214 - Realization of Smooth Organic Thin Film by Electrospray Deposition Technique
ASANO TAKASHI; TAKAGI KENJI; FUKUDA TAKESHI; JU JUNGMYOUNG; HONDA ZENTARO; KAMATA NORIHIKO; TAJIMA YUSUKE; AOYAMA TETSUYA; YAMAGATA YUTAKA
電子情報通信学会技術研究報告, Volume：110, Number：243(OME2010 46-54), First page：11, Last page：14, 15 Oct. 2010
Japanese
ISSN：0913-5685, J-Global ID：201002242609132961 - 25aWP-12 New high magnetic field phase of the frustrated S=1/2 ferromagnetic chain LiCuVO_4
Hagiwara M.; Fujita T.; Yamaguchi H.; Kimura S.; Omura K.; Svistov L. E.; Prokofiev A.; Smironov A. I.; Honda Z.
Meeting abstracts of the Physical Society of Japan, Volume：65, Number：2, First page：397, Last page：397, 18 Aug. 2010
The Physical Society of Japan (JPS), Japanese
ISSN：1342-8349, CiNii Articles ID：110008097944, CiNii Books ID：AA11439205 - 24pWL-3 Phase transitions in cobalt kagome lattice magnet Co(N_3)_2(bpg)
Honda Z.; Katori H. Aruga; Hagiwara M.; Fukuda T.; Kamata N.
Meeting abstracts of the Physical Society of Japan, Volume：65, Number：2, First page：386, Last page：386, 18 Aug. 2010
The Physical Society of Japan (JPS), Japanese
ISSN：1342-8349, CiNii Articles ID：110008097899, CiNii Books ID：AA11439205 - 21pGJ-12 Magnetic properties of a nickel double chain compound Ni(bpy)SO_4(H_2O)_2 in magnetic fields
Honda Z.; Aruga Katori H.; Kimura S.; Hagiwara M.; Fukuda T.; Kamata N.
Meeting abstracts of the Physical Society of Japan, Volume：65, Number：1, First page：480, Last page：480, 01 Mar. 2010
The Physical Society of Japan (JPS), Japanese
ISSN：1342-8349, CiNii Articles ID：110007655162, CiNii Books ID：AA11439205 - Stability of sol-gel derived glass coated Eu complex using deuterated methanol
Takeshi Fukuda; Shuhei Yamauchi; Zentaro Honda; Norihiko Kamata; Naoto Kijima
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS, Volume：3, Number：9, First page：296, Last page：298, Dec. 2009
A high-stability Eu complex has been achieved by coating with a silica glass via a low temperature sol-gel process using deuterated methanol. A three-dimensional glass network, protects the Eu complex from free oxygen and/or water to change the ligand structure. In addition, the chemical bond of the deuterated Eu complex is more stable than that of the conventional Eu complex, Therefore, we achieved a high-thermal stability Eu complex encapsulated by a sol-gel derived silica glass using deuterated methanol instead of ethanol.
[GRAPHICS]
(C) 2009 WILEY-VCH Verlag GmbH & Co KGaA, Weinheim
WILEY-V C H VERLAG GMBH, English
DOI：https://doi.org/10.1002/pssr.200903223
DOI ID：10.1002/pssr.200903223, ISSN：1862-6254, Web of Science ID：WOS:000272669300008 - Organic photoconductive device fabricated by electrospray deposition method
Takeshi Fukuda; Takashi Suzuki; Ryohei Kobayashi; Zentaro Honda; Norihiko Kamata
Thin Solid Films, Volume：518, Number：2, First page：575, Last page：578, 30 Nov. 2009
We demonstrated a blue-sensitive organic photoconductive device fabricated by an electrospray deposition method. Poly[9,9-dioctylfluorenyl-2,7-diyl]-co-1,4-benzo-(2,1,3)-thiadiazole (F8BT) was chosen as a blue-sensitive polymer, and a maximum external quantum efficiency of 0.22% was achieved at the irradiated optical intensity of 3.9 mW/cm2. The absorption spectrum of F8BT neat film showed that the selectivity of spectral responses at the blue wavelength region was good enough to divide the incident light into blue color components. These results indicate the possibility of a color separation without a prism for high resolution cameras by combination of green and red sensitive organic photoconductive devices. © 2009 Elsevier B.V. All rights reserved.
English
DOI：https://doi.org/10.1016/j.tsf.2009.07.020
DOI ID：10.1016/j.tsf.2009.07.020, ISSN：0040-6090, SCOPUS ID：70349976771 - Improved stability of organic-inorganic composite emitting film with sol-gel glass encapsulated Eu-complex
Takeshi Fukuda; Shuhei Yamauchi; Zentaro Honda; Naoto Kijima; Norihiko Kamata
OPTICAL MATERIALS, Volume：32, Number：1, First page：207, Last page：211, Nov. 2009
A high-stability organic-inorganic composite emitting film has been realized via a sol-gel process using an optimized silane alkoxide and Eu-complex. We found that the long-term and thermal stabilities were improved by using a combined starting solution of phenyltrimethoxysilane and tetrametoxysilane as encapsulating agent. The resulting emitting film exhibited sharp red-luminescence under ultraviolet (UV) excitation and a high transparency in the visible wavelength region. In addition. no decrease in photoluminescence (PL) quantum yield was observed after thermal treatment up to 180 degrees C. and the reduction in PL intensity during UV irradiation was suppressed by encapsulating the Eu-complex within the sod-gel derived silica glass. (C) 2009 Elsevier B.V. All rights reserved.
ELSEVIER SCIENCE BV, English
DOI：https://doi.org/10.1016/j.optmat.2009.07.020
DOI ID：10.1016/j.optmat.2009.07.020, ISSN：0925-3467, CiNii Articles ID：80020772721, Web of Science ID：WOS:000271888500037 - Organic photoconductive device fabricated by electrospray deposition method
Takeshi Fukuda; Takashi Suzuki; Ryohei Kobayashi; Zentaro Honda; Norihiko Kamata
THIN SOLID FILMS, Volume：518, Number：2, First page：575, Last page：578, Nov. 2009
We demonstrated a blue-sensitive organic photoconductive device fabricated by an electrospray deposition method. Poly[9,9-dioctylfluorenyl-2,7-diyl]-co-1,4-benzo-(2,1,3)-thiadiazole (F8BT) was chosen as a blue-sensitive polymer, and a maximum external quantum efficiency of 0.22% was achieved at the irradiated optical intensity of 3.9 mW/cm(2). The absorption spectrum of F8BT neat film showed that the selectivity of spectral responses at the blue wavelength region was good enough to divide the incident light into blue color components. These results indicate the possibility of a color separation without a prism for high resolution cameras by combination of green and red sensitive organic photoconductive devices. (C) 2009 Elsevier B.V. All rights reserved.
ELSEVIER SCIENCE SA, English
DOI：https://doi.org/10.1016/j.tsf.2009.07.020
DOI ID：10.1016/j.tsf.2009.07.020, ISSN：0040-6090, Web of Science ID：WOS:000271776300039 - Wavelength conversion film with glass coated Eu chelate for enhanced silicon-photovoltaic cell performance
Takeshi Fukuda; Sayaka Kato; Eimo Kin; Kaoru Okaniwa; Hiroaki Morikawa; Zentaro Honda; Norihiko Kamata
OPTICAL MATERIALS, Volume：32, Number：1, First page：22, Last page：25, Nov. 2009
In order to improve the conversion efficiency of a silicon-photovoltaic (PV) module, we investigated the combination with a wavelength conversion film (WCF), which consists of Eu chelate particles encapsulated by the sol-gel derived silica glass. The photoluminescence (PL) excitation spectrum of Eu chelate shows that the violet light below 400 nm is effectively converted to the red emission at 613 nm. Since the PV cell has higher sensitivity at the red wavelength region compared to the violet region, Eu chelate is one of the suitable material for a WCF. The diameter of fabricated sol-gel encapsulated Eu chelate was larger than the wavelength of irradiated sunlight, therefore, the transmittance of a WCF decreased with increasing the concentration of Eu chelate. The short circuit current (J(SC)) was increased by inserting the the WCF on the front side of Si-PV cell compared to the reference module (glass/ethylene vinyl acetate/WCF without Eu chelate/Si-PV cell/EVA/back-film), and the maximum increase of Delta J(SC) was 1.03 mA/cm(2) compared to the reference module. However, the maximum Delta J(SC) of fabricated module was almost same as the conventional Si-PV cell due to the refractive index mismatch of each layers. (C) 2009 Elsevier B.V. All rights reserved.
ELSEVIER SCIENCE BV, English
DOI：https://doi.org/10.1016/j.optmat.2009.05.016
DOI ID：10.1016/j.optmat.2009.05.016, ISSN：0925-3467, CiNii Articles ID：80020772689, Web of Science ID：WOS:000271888500005 - Improved stability of organic-inorganic composite emitting film with sol-gel glass encapsulated Eu-complex
Takeshi Fukuda; Shuhei Yamauchi; Zentaro Honda; Naoto Kijima; Norihiko Kamata
OPTICAL MATERIALS, Volume：32, Number：1, First page：207, Last page：211, Nov. 2009
A high-stability organic-inorganic composite emitting film has been realized via a sol-gel process using an optimized silane alkoxide and Eu-complex. We found that the long-term and thermal stabilities were improved by using a combined starting solution of phenyltrimethoxysilane and tetrametoxysilane as encapsulating agent. The resulting emitting film exhibited sharp red-luminescence under ultraviolet (UV) excitation and a high transparency in the visible wavelength region. In addition. no decrease in photoluminescence (PL) quantum yield was observed after thermal treatment up to 180 degrees C. and the reduction in PL intensity during UV irradiation was suppressed by encapsulating the Eu-complex within the sod-gel derived silica glass. (C) 2009 Elsevier B.V. All rights reserved.
ELSEVIER SCIENCE BV, English
DOI：https://doi.org/10.1016/j.optmat.2009.07.020
DOI ID：10.1016/j.optmat.2009.07.020, ISSN：0925-3467, CiNii Articles ID：80020772721, Web of Science ID：WOS:000271888500037 - 27aQJ-1 Magnetic properties of an S=1/2 square lattice antiferromagnet Cu(pyz)_2(ClO_4)_2 in magnetic fields
Honda Z.; Fukuda T.; Kamata N.; Katori H. Aruga; Hagiwara M.
Meeting abstracts of the Physical Society of Japan, Volume：64, Number：2, First page：366, Last page：366, 18 Aug. 2009
The Physical Society of Japan (JPS), Japanese
ISSN：1342-8349, CiNii Articles ID：110007497305, CiNii Books ID：AA11439205 - 25pQJ-6 Magnetism and ESR in the S=2 one-dimensional Heisenberg antiferromagnet MnCl_3(bpy)
Idutsu Y.; Hagiwara M.; Kashiwagi T.; Honda Z.; Yamamoto S.
Meeting abstracts of the Physical Society of Japan, Volume：64, Number：2, First page：331, Last page：331, 18 Aug. 2009
The Physical Society of Japan (JPS), Japanese
ISSN：1342-8349, CiNii Articles ID：110007497170, CiNii Books ID：AA11439205 - Thermal stability of europium(III) chelate encapsulated by sol-gel glass
E. Kin; T. Fukuda; S. Yamauchi; Z. Honda; H. Ohara; T. Yokoo; N. Kijima; N. Kamata
JOURNAL OF ALLOYS AND COMPOUNDS, Volume：480, Number：2, First page：908, Last page：911, Jul. 2009
In order to improve the stability of high color-purity red phosphors for ultraviolet excitation, we encapsulated an Eu-chelate, Eu(HFA)(3)(TPPO)(2), by sol-gel derived glass networks and studied its thermal stability as well as photoluminescence (PL) characteristics. The PL quantum yield of an encapsulated sample was 14 times higher than that without encapsulation after annealing at 160 degrees C for 2 h in air. Three-dimensional glass networks with a sufficient density were shown to reduce thermal quenching of Eu(HFA)(3)(TPPO)(2). Therefore, it is revealed that the surface coating of luminous chelates by sol-gel glasses is an effective way of inorganic and organic hybridization for high-stability of chelate bonding against free oxygen and water. (C) 2009 Elsevier B.V. All rights reserved.
ELSEVIER SCIENCE SA, English
DOI：https://doi.org/10.1016/j.jallcom.2009.02.063
DOI ID：10.1016/j.jallcom.2009.02.063, ISSN：0925-8388, CiNii Articles ID：80020384300, Web of Science ID：WOS:000267798600155 - Thermal stability of europium(III) chelate encapsulated by sol-gel glass
E. Kin; T. Fukuda; S. Yamauchi; Z. Honda; H. Ohara; T. Yokoo; N. Kijima; N. Kamata
JOURNAL OF ALLOYS AND COMPOUNDS, Volume：480, Number：2, First page：908, Last page：911, Jul. 2009
In order to improve the stability of high color-purity red phosphors for ultraviolet excitation, we encapsulated an Eu-chelate, Eu(HFA)(3)(TPPO)(2), by sol-gel derived glass networks and studied its thermal stability as well as photoluminescence (PL) characteristics. The PL quantum yield of an encapsulated sample was 14 times higher than that without encapsulation after annealing at 160 degrees C for 2 h in air. Three-dimensional glass networks with a sufficient density were shown to reduce thermal quenching of Eu(HFA)(3)(TPPO)(2). Therefore, it is revealed that the surface coating of luminous chelates by sol-gel glasses is an effective way of inorganic and organic hybridization for high-stability of chelate bonding against free oxygen and water. (C) 2009 Elsevier B.V. All rights reserved.
ELSEVIER SCIENCE SA, English
DOI：https://doi.org/10.1016/j.jallcom.2009.02.063
DOI ID：10.1016/j.jallcom.2009.02.063, ISSN：0925-8388, CiNii Articles ID：80020384300, Web of Science ID：WOS:000267798600155 - 28aTG-5 Ultra low temperature multi-Frequency ESR studies on a quantum magnet-II
Kashiwagi T.; Hagiwara M.; Yashiro H.; Idutsu Y.; Honda Z.
Meeting abstracts of the Physical Society of Japan, Volume：64, Number：1, First page：473, Last page：473, 03 Mar. 2009
The Physical Society of Japan (JPS), Japanese
ISSN：1342-8349, CiNii Articles ID：110007371441, CiNii Books ID：AA11439205 - 30aTG-1 Magnetic properties of spinel compound GeFe_2O_4
Aruga Katori H.; Hayashi H.; Honda Z.; Takagi H.
Meeting abstracts of the Physical Society of Japan, Volume：64, Number：1, First page：515, Last page：515, 03 Mar. 2009
The Physical Society of Japan (JPS), Japanese
ISSN：1342-8349, CiNii Articles ID：110007371586, CiNii Books ID：AA11439205 - ゾル-ゲルガラスで封止したEu錯体含有蛍光薄膜の信頼性向上
山内修平; 福田武司; 本多善太郎; 木島直人; 鎌田憲彦
Volume：93, Number：11, First page：790, Last page：793, 2009
DOI：https://doi.org/10.2150/jieij.93.790
DOI ID：10.2150/jieij.93.790, ISSN：0019-2341, CiNii Articles ID：110007486921 - Stability of sol-gel derived glass coated Eu complex using deuterated methanol
Takeshi Fukuda; Shuhei Yamauchi; Zentaro Honda; Norihiko Kamata; Naoto Kijima
Physica Status Solidi - Rapid Research Letters, Volume：3, Number：9, First page：296, Last page：298, 2009
A high-stability Eu complex has been achieved by coating with a silica glass via a low temperature sol-gel process using deuterated methanol. A three-dimensional glass network protects the Eu complex from free oxygen and/or water to change the ligand structure. In addition, the chemical bond of the deuterated Eu complex is more stable than that of the conventional Eu complex. Therefore, we achieved a high-thermalstability Eu complex encapsulated by a sol-gel derived silica glass using deuterated methanol instead of ethanol. © 2009 WILEY-VCH Verlag GmbH &
Co. KGaA, Weinheim.
English
DOI：https://doi.org/10.1002/pssr.200903223
DOI ID：10.1002/pssr.200903223, ISSN：1862-6254, SCOPUS ID：73949088864 - High-field multifrequency electron-spin-resonance study of the Haldane magnet Ni(C5H14N2)(2)N-3(PF6)
T. Kashiwagi; M. Hagiwara; S. Kimura; Z. Honda; H. Miyazaki; I. Harada; K. Kindo
PHYSICAL REVIEW B, Volume：79, Number：2, First page：024403, Jan. 2009
In order to understand physical properties of the field-induced phase of a spin-gap system, we performed high-field and multifrequency electron-spin-resonance (ESR) measurements on single crystals of the S=1 quasi-one-dimensional Heisenberg antiferromagnet, namely, the Haldane magnet, Ni(C5H14N2)(2)N-3(PF6), abbreviated as NDMAP. This compound has an energy gap (Haldane gap) at zero field and one of the excited triplet branches goes down on applying magnetic fields, resulting in the gap closing at a critical field H-c around 5 T that is slightly different depending on the field direction. First, we studied the angular dependence of spin excitations below 14 T. Two sets of resonance modes caused by two types of Ni2+ chains in NDMAP are observed. These data are analyzed by comparing with a phenomenological field theory (PFT). The experimental results between H-c and about 12 T are well fitted with the calculated ones by the PFT, but the fitting above 12 T is not satisfactory. Therefore, we studied spin excitations at much higher magnetic fields up to about 55 T. Several ESR signals are observed above H-c for each crystallographic axis, and one or two of them survive in the high-field region above about 15 T. One mode approaches a paramagnetic resonance line at high fields and the other mode broadly changes with magnetic fields. These modes fit well with the conventional antiferromagnetic resonance modes with biaxial anisotropy. This result suggests that the quantum fluctuations are suppressed by strong magnetic field and the spin excitations change from a quantum nature to a classical one in high magnetic fields.
AMER PHYSICAL SOC, English
DOI：https://doi.org/10.1103/PhysRevB.79.024403
DOI ID：10.1103/PhysRevB.79.024403, ISSN：1098-0121, CiNii Articles ID：120001371303, Web of Science ID：WOS:000262978100048 - Multi-frequency ESR in the Haldane magnet NDMAP below 1 K
T. Kashiwagi; M. Hagiwara; S. Kimura; H. Miyazaki; I. Harada; Z. Honda
25TH INTERNATIONAL CONFERENCE ON LOW TEMPERATURE PHYSICS (LT25), PART 4, Volume：150, First page：042083 1-4, 2009
The S=1 quasi-one dimensional Heisenberg antiferromagnet Ni(C5H14N2)(2)N-3(PF6), abbreviated as NDMAP, has been studied by electron spin resonance (ESR) in a magnetic field exceeding the critical field (H-c) above which this compound shows a long range order (LRO) at sufficiently low temperatures. Our recently developed ESR apparatus with a dilution refrigerator is utilized to study the spin excitations of NDMAP above H-c for H parallel to c, because this compound exhibits the LRO below about 1 K. The spin excitation modes above H-c observed below 1 K do not show any difference from those at 1.5 K and the lowest excitation mode observed at 30 mK in the inelastic neutron experiments above H-c was not observed at about 200 mK in this study. Accordingly, the result suggests that the lowest excitation mode is very sensitive to temperature.
IOP PUBLISHING LTD, English
DOI：https://doi.org/10.1088/1742-6596/150/4/042083
DOI ID：10.1088/1742-6596/150/4/042083, ISSN：1742-6588, Web of Science ID：WOS:000289891200083 - Improved Durability of Eu Chelate Encapsulated by Silica Glass Film Prepared by Sol-Gel Method
Shuhei Yamauchi; Fukuda Takeshi; Zentaro Honda; Kijima Naoto; Norihiko Kamata
Journal of the Illuminating Engineering Institute of Japan (Shomei Gakkai Shi), Volume：93, Number：11, First page：790, Last page：793, 2009
We demonstrated an improved durability of Eu(HFA)3(TPPO) 2 [tris(hexafluoroacetylacetonato)- europium(III) 1,2-phenylenebis(diphenylphosphine oxide)1 encapsulated by a sol-gel derived silica glass film. The film was constructed using phenyltrimethoxysilane and diethoxy- dimethylsilane as a starting solution. Unlike cases in which conventional tetramethoxysilane is used, no decrease in internal quantum efficiency was observed at room temperature. We further improved the thermal and long-term stability of Eu(HFA)3(TPPO)2 inside the transparent glass film at elevated annealing temperatures when compared to the Eu(HFA)3(TPPO)2 powder itself: The photoluminescence quantum efficiency of the transparent film was 60% at 160°C and 32% at 200°C. Properly prepared glass networks protect the Eu chelate from free oxygen and water in the transparent glass film, which is promising for future practical applications.
Japanese
DOI：https://doi.org/10.2150/jieij.93.790
DOI ID：10.2150/jieij.93.790, ISSN：0019-2341, CiNii Articles ID：110007486921, SCOPUS ID：77951919511 - Magneto-transport study on quasi 1-D magnet of Ca(3)(Co(1-x)M(x))(2)O(6) (M : Ni, Fe, V, Ti; x <= 0.1)
Jiaolian Luo; Makoto Aida; Koji Yamada; Zentarou Honda; Toshirou Sakakibara; Takashi Tayama; Isao J. Ohsugi
JOURNAL OF OPTOELECTRONICS AND ADVANCED MATERIALS, Volume：10, Number：5, First page：1032, Last page：1037, May 2008
Magneto-transport phenomena in Ca(3)(Co(1-x)M)(2)O(6) (M: Ni, Fe, V, Ti, x <= 0.1) were investigated in a temperature range 12K-RT in dc fields up to 6T and pulsed magnetic fields up to 20T, respectively. The substitutions of Co with several metal M's were discussed by measuring magnetic susceptibilities and resistivities in the paramagnetic temperature range between of 77K-RT, to understand and apply the 3D physical natures. Future device of magnetic flip-flop is proposed by using the magnetic coupling formations of trigonal prisms.
NATL INST OPTOELECTRONICS, English
ISSN：1454-4164, Web of Science ID：WOS:000256499900008 - 25pWL-6 Magnetic properties of hollandite-type MnO_2 with an open tunnel
Honda Z.; Aida M.; Saito Y.; Hagiwara M.; Katori H. Aruga
Meeting abstracts of the Physical Society of Japan, Volume：63, Number：1, First page：498, Last page：498, 29 Feb. 2008
The Physical Society of Japan (JPS), Japanese
ISSN：1342-8349, CiNii Articles ID：110007195473, CiNii Books ID：AA11439205 - 23pWK-4 Neutron Scattering Study in Spinel LiCrMnO_4
Matsuda M.; Honda Z.; Katori H. Aruga; Takagi H.
Meeting abstracts of the Physical Society of Japan, Volume：63, Number：1, First page：460, Last page：460, 29 Feb. 2008
The Physical Society of Japan (JPS), Japanese
ISSN：1342-8349, CiNii Articles ID：110007195758, CiNii Books ID：AA11439205 - 新しいスピンラダー物質の磁性と相転移
本多善太郎
Volume：6 (平成19年度), 2008 - 新しいスピンラダー物質の磁性と相転移
本多善太郎
総合研究機構研究プロジェクト研究成果報告書, Volume：6 (平成19年度), 2008 - Novel spin excitations in the field-induced phase of the haldane magnet Ni(C5H14N2)(2)N-3(PF6)
Takanari Kashiwagi; Masayuki Hagiwara; Shojiro Kimura; Zentaro Honda; Koichi Kindo
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, Volume：76, Number：10, First page：103703 1-4, Oct. 2007
We have performed electron spin resonance measurements on single crystals of the S = 1 onedimensional Heisenberg antiferromagnet Ni(C5H14N2)(2)N-3(PF6) in magnetic fields up to about 55 T and at frequencies up to about 2 THz. For both H parallel to chain and H perpendicular to chain, we have found that one of the two or three excitation modes that are observed in magnetic fields between the critical field (H-c) and about 15 T survives in the high-field region. This mode approaches a paramangetic resonance line at high-fields and fits well with the conventional antiferromagnetic resonance mode with easy-plane anisotropy. This result suggests that the spin-excitation modes above H, change from modes affected by quantum fluctuations to those expected for a conventional antiferromagnet.
PHYSICAL SOC JAPAN, English
DOI：https://doi.org/10.1143/JPSJ.76.103703
DOI ID：10.1143/JPSJ.76.103703, ISSN：0031-9015, Web of Science ID：WOS:000250247600004 - 21aWB-11 Specific heat of S=1/2 spin ladder compounds Cu(A)X_2 under magnetic fields
Honda Z.; Katori H. Aruga; Aida M.; Sakata M.
Meeting abstracts of the Physical Society of Japan, Volume：62, Number：2, First page：429, Last page：429, 21 Aug. 2007
The Physical Society of Japan (JPS), Japanese
ISSN：1342-8349, CiNii Articles ID：110007141476, CiNii Books ID：AA11439205 - 22aPS-105 Temperature dependence of the resonance fields of one dimensional magnets
Koda S.; Yashiro H.; Hagiwara M.; Honda Z.
Meeting abstracts of the Physical Society of Japan, Volume：62, Number：2, First page：483, Last page：483, 21 Aug. 2007
The Physical Society of Japan (JPS), Japanese
ISSN：1342-8349, CiNii Articles ID：110007141627, CiNii Books ID：AA11439205 - Magnetic properties of the spin-ladder material Na2CO2(C2O4)(3)(H2O)(2) doped with Zn
A. Kikkawa; K. Katsumata; Z. Honda; K. Yamada
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, Volume：310, Number：2, First page：1239, Last page：1241, Mar. 2007
Effects of Zn impurities on a spin-ladder material Na2Co(2)(C2O4)(3)(H2O)(2) are reported. We measured,the magnetic susceptibility, chi on a single crystal and find that chi at a high field shows a broad peak at about 20 K and a Curie-tail at low temperatures. We interpret the low temperature Curie-tail as due to an induced moment around Zn impurities. At a low field, we find a spin-glass behavior evidenced by a difference in chi for field cooled and zero field cooled measurements. We present a possible mechanism for the appearance of this spin glass. (c) 2006 Elsevier B.V. All rights reserved.
ELSEVIER SCIENCE BV, English
DOI：https://doi.org/10.1016/j.jmmm.2006.10.368
DOI ID：10.1016/j.jmmm.2006.10.368, ISSN：0304-8853, Web of Science ID：WOS:000247618700234 - Novel spin excitation in the high field phase of an S=1 antiferromagnetic chain
M. Hagiwara; T. Kashiwagia; S. Kimuraa; Z. Honda; K. Kindo
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, Volume：310, Number：2, First page：1272, Last page：1274, Mar. 2007
We report the results of high-field multi-frequency ESR experiment on the S = 1 Heisenberg antiferromagnetic chain Ni(C5H14N2)(2)N-3 (PF6) for the fields up to about 55 T and the frequencies up to about 2 THz. We have found that excitation branches above the critical field (H-c) where the energy gap closes change into one branch around 15 T which becomes close to the paramagnetic line at high fields. The branch above 15 T fits well the conventional antiferromagnetic resonance mode with easy planar anisotropy. We compare the results with those in a weakly coupled antiferromagnetic dimer compound KCuCl3 and discuss the origin of the branches observed above Hc. (c) 2006 Published by Elsevier B.V.
ELSEVIER SCIENCE BV, English
DOI：https://doi.org/10.1016/j.jmmm.2006.10.435
DOI ID：10.1016/j.jmmm.2006.10.435, ISSN：0304-8853, Web of Science ID：WOS:000247618700245 - Muon spin relaxation measurements on a spin-ladder material Na2Co2(C2O4)(3)(H2O)(2)
Akiko Kikkawa; Koichi Katsumata; Zentaro Honda; Isao Watanabe; Takao Suzuki; Teiichiro Matsuzaki
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, Volume：76, Number：2, First page：023707 1-4, Feb. 2007
Positive muon spin-relaxation (mu+SR) measurements on a spin-ladder material Na2Co2(C2O4)(3)(H2O)(2) are reported. We find that the relaxation rate, lambda, under a longitudinal field of 3950 Oe increases with decreasing temperature, T, and is a maximum at T-peak similar or equal to 18 K. Below T-peak, lambda decreases with decreasing T. This finding implies the observation of a spin gap formation by mu+SR technique. The approach of the exponent beta in the relaxation function to 0.5 with decreasing T suggests a freezing of dilute moments. Below about 5 K, we observe a sinusoidal oscillation in the time spectrum in zero applied field, which indicates an onset of long-range magnetic order. All these observations give microscopic evidence that the spin-ladder material is close to a quantum critical point.
PHYSICAL SOC JAPAN, English
DOI：https://doi.org/10.1143/JPSJ.76.023707
DOI ID：10.1143/JPSJ.76.023707, ISSN：0031-9015, Web of Science ID：WOS:000244466000015 - 三角格子拮抗型スピンのマイクロ磁気 室温での応用を目指して
羅嬌蓮; 山田興治; 本多善太郎; 会田真; 大杉功; 榊原俊郎; 田山孝
Volume：15, First page：156, Last page：161, 2007 - ＬＢ膜の自己再構築による有機無機層状ペロブスカイト膜作成法の開発
本多善太郎
Volume：5 (平成18年度), First page：634, Last page：635, 2007 - Precision measurements of eddy current loss for small samples
山田興治; 羅姣蓮; 韓旭; 草木一将; 本多善太郎; 匂坂充行; 磯部仁博
Volume：8, Number：8, First page：36, Last page：39, 2007
For non-destructive evaluation of eddy current losses in small samples as TEM samples are developed for iron-based material by the magnetic bridge with ac magnetic field transmission. We found the power laws of transmission on frequency, permeability, thickness and conductivity with a high accuracy of 0.1% error.
Japanese
ISSN：1347-4758, CiNii Articles ID：120001371270, CiNii Books ID：AA11808968 - 三角格子拮抗型スピンのマイクロ磁気 室温での応用を目指して
羅嬌蓮; 山田興治; 本多善太郎; 会田真; 大杉功; 榊原俊郎; 田山孝
日本ＡＥＭ学会誌, Volume：15, Number：2, First page：156, Last page：161, 2007
The frustrated spin system of quasi-one dimension magnet of Ca_3Co_<2-x>M_xO_6(M: metal) single crystals has been investigated in a temperature range between 10K and RT and in a magnetic field range up to 20 T. We aim at the application of the unstable spin state as a flip-flop circuit device using the behavior of the spin frustration in the future. For these purposes, the basic behaviors of the magneto-transport phenomena were studied by using samples with different M. The stable state and unstable state of the magneto-resistances were apparently found in this experiment.
Japanese
ISSN：0919-4452, CiNii Articles ID：110006291398, CiNii Books ID：AN10457520 - ＬＢ膜の自己再構築による有機無機層状ペロブスカイト膜作成法の開発
本多善太郎
総合研究機構研究プロジェクト研究成果報告書, Volume：5 (平成18年度), First page：634, Last page：635, 2007 - 微小試料の精密渦電流損測定
山田興治; 羅姣蓮; 韓旭; 草木一将; 本多善太郎; 匂坂充行; 磯部仁博
埼玉大学地域共同研究センター紀要, Volume：8, Number：8, First page：36, Last page：39, 2007
For non-destructive evaluation of eddy current losses in small samples as TEM samples are developed for iron-based material by the magnetic bridge with ac magnetic field transmission. We found the power laws of transmission on frequency, permeability, thickness and conductivity with a high accuracy of 0.1% error.
Japanese
ISSN：1347-4758, CiNii Articles ID：120001371270, CiNii Books ID：AA11808968 - Magnetic excitations from the singlet dimerized state in Na2Co2(C2O4)(3)(H2O)(2)
M. Matsuda; S. Wakimoto; K. Kakurai; Z. Honda; K. Yamada
PHYSICAL REVIEW B, Volume：75, Number：1, First page：012405, Jan. 2007
Na2Co2(C2O4)(3)(H2O)(2) consists of two-leg ladders of Co2+ ions. It was reported that this is a candidate compound to show a magnetic state in the vicinity of the gapped and the Neel ordered state, where the quantum phase transition occurs [Z. Honda , Phys. Rev. Lett. 95, 087204 (2005)]. Neutron scattering experiments were performed to study the magnetic ground state of this compound. It is found that the system is well described by an almost isolated dimer model, in which dimers are formed between spins along the rung direction and the interaction along the rung direction is much larger than that along the leg direction. The intradimer coupling constant is determined to be 5.2 meV. Other interactions were found to be very small.
AMERICAN PHYSICAL SOC, English
DOI：https://doi.org/10.1103/PhysRevB.75.012405
DOI ID：10.1103/PhysRevB.75.012405, ISSN：1098-0121, CiNii Articles ID：80017881207, Web of Science ID：WOS:000243894600016 - High field ESR and magnetization in Na2Co2(C2O4)(3)(H2O)(2)
Yoshiyuki Nakagawa; Takanari Kashiwagi; Hironori Yamaguchi; Shojiro Kimura; Zentaro Honda; Koji Yamada; Koichi Kindo; Masayuki Hagiwara
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, Volume：75, Number：12, First page：124708, Dec. 2006
We report the results of electron spin resonance (ESR) and magnetization measurements in high magnetic fields up to about 52T on single crystal and powder samples of the cobalt compound Na2Co2(C2O4)(3)(H2O)(2) which consists of two-leg ladders of Co2+ ions. This compound was reported to be a candidate which show a signature of a quantum phase transition from a spin-liquid to a Neel ordered state [Z. Honda et al.: Phys. Rev. Lett. 95 (2005) 087204]. From our ESR and magnetization experiments, we, however, have found that the compound is well described by almost isolated antiferromagnetic dimers which are formed by the nearest Co spins on the rungs and the interaction along the rung direction is much larger than that along the leg one. The ESR frequency-field diagram, magnetic susceptibility and magnetization are in good agreement with those calculated from this isolated dimer model.
PHYSICAL SOC JAPAN, English
DOI：https://doi.org/10.1143/JPSJ.75.124708
DOI ID：10.1143/JPSJ.75.124708, ISSN：0031-9015, Web of Science ID：WOS:000243045100031 - Charge/orbital ordering vs. Jahn-Teller distortion in La0.5Sr1.5MnO4
U. Staub; V. Scagnoli; A. M. Mulders; M. Janousch; Z. Honda; J. M. Tonnerre
EUROPHYSICS LETTERS, Volume：76, Number：5, First page：926, Last page：932, Dec. 2006
Temperature dependences of a magnetic and an orbital Bragg reflection at the Mn L-2,L-3 edges of Lac(0.5)Sr(1.5)MnO(4) have been collected. The temperature evolution of the orbital reflection depends strongly on the X-ray energy and reflects the different order parameters, which are assigned to orbitals and Jahn-Teller distortions. The Jahn-Teller order parameter saturates at 150 K, whereas the orbital order parameter gradually increases. These results are discussed in context with the possible driving forces, the orbital-orbital super exchange and the Jahn-Teller strain field interaction.
EDP SCIENCES S A, English
DOI：https://doi.org/10.1209/epl/i2006-10343-x
DOI ID：10.1209/epl/i2006-10343-x, ISSN：0295-5075, Web of Science ID：WOS:000242941000028 - Giant magneto-resistance in p-n junction composed of beta-FeSi2-Si
Koji Yamada; Hirohisa Ogawa; Zentarou Honda; Kiyoshi Miyake
JOURNAL OF ALLOYS AND COMPOUNDS, Volume：423, Number：1-2, First page：197, Last page：200, Oct. 2006
Fe-Si alloy system was investigated on the magneto-resistance (MR) effects in a temperature range between 77K-RT and in high fields up to 30 T. The samples were prepared by sputtering Fe(200 nm) on n-Si(1 0 0) surface and variously annealed up to beta-FeSi2 are obtained. The MR effects were found small less than several %, negative at RT and positive at T=77 K for Fe-rich samples. For a sample at the stoichiometric beta-Fe-Si-2 on n-Si as a p-n junction, we found a positive MR as large as 30% at RT in B = 30 T. The physical mechanism of the large MR is tentatively given by the carrier freeze-out effect in between the p-n. (c) 2006 Elsevier B.V. All rights reserved.
ELSEVIER SCIENCE SA, English
DOI：https://doi.org/10.1016/j.jallcom.2006.01.101
DOI ID：10.1016/j.jallcom.2006.01.101, ISSN：0925-8388, CiNii Articles ID：120001370634, Web of Science ID：WOS:000241260400050 - Field induced spin transitions and large magnetoresistance in the quasi-one-dimensional magnet Ca3Co2O6
Koji Yamada; Zentarou Honda; Jiaolian Luo; Hiroko Katori
JOURNAL OF ALLOYS AND COMPOUNDS, Volume：423, Number：1-2, First page：188, Last page：190, Oct. 2006
Magnetic and magnetoresistance effect of needle shaped crystal and slightly Co rich Ca3Co2O6 was investigated in a temperature range between 2 and 100 K and in a dc magnetic field range less than 7 T and in pulsed fields less than 20 T. We found 1/3m(s) and 2/3m(s) plateaus of the magnetization for the full magnetization m, and large negative magnetoresistance effect of 10% at the same magnetic fields, respectively. (c) 2006 Elsevier B.V. All rights reserved.
ELSEVIER SCIENCE SA, English
DOI：https://doi.org/10.1016/j.jallcom.2005.12.109
DOI ID：10.1016/j.jallcom.2005.12.109, ISSN：0925-8388, CiNii Articles ID：120001370528, Web of Science ID：WOS:000241260400047 - 27pSB-2 NMR Study on S=1 Antiferromagnetic chain NDMAP II
Matsubara S.; Ogata N.; Takigawa M.; Hagiwara M.; Honda Z.; Yamada K.
Meeting abstracts of the Physical Society of Japan, Volume：61, Number：1, First page：426, Last page：426, 04 Mar. 2006
The Physical Society of Japan (JPS), Japanese
ISSN：1342-8349, CiNii Articles ID：110007177636, CiNii Books ID：AA11439205 - 三角格子配置拮抗型スピンのマイクロ磁気 室温での応用を目指して
羅矯蓮; 山田興治; 本多善太郎; 会田真; 大杉功; 榊原俊郎; 田山孝
Volume：2006, First page：06-M21, 2006 - Magnetic field-induced second transition of the Haldane-gap antiferromagnet Ni(C5H14N2)(2)N-3(PF6)
H. Tsujii; Z. Honda; B. Andraka; K. Katsumata; Y. Takano
LOW TEMPERATURE PHYSICS, PTS A AND B, Volume：850, First page：1045, Last page：+, 2006
We have used the magnetocaloric effect to investigate the new transition that was recently discovered in the Haldane-gap antiferromagnet Ni(C5H14N2)(2)N-3(PF6) at H-c2 approximate to 14 T and at temperatures below 0.886 K. According to the specific-heat data in which this transition was observed in a magnetic field applied in the spin-chain direction, H,2 is nearly temperature-independent. Measured as a function of magnetic field, the variation of the sample temperature due to the magnetocaloric effect indicates that the transition at H,,2 is second order. It also shows that the magnetization of the new phase above H,2 decreases with increasing temperature, whereas it decreases with increasing temperature in the previously known, commensurate phase below H-c2. We propose the relevance of the Tomonaga-Luttinger spin liquid or the weak in-plane anisotropy of Ni(C5H14N2)(2)N-3(PF6) to the new phase.
AMER INST PHYSICS, English
ISSN：0094-243X, Web of Science ID：WOS:000243396400470 - 三角格子配置拮抗型スピンのマイクロ磁気 室温での応用を目指して
羅矯蓮; 山田興治; 本多善太郎; 会田真; 大杉功; 榊原俊郎; 田山孝
日本ＡＥＭ学会ＭＡＧＤＡ特集号, Volume：2006, First page：06-M21, 2006 - High field magnetization and multi-frequency ESR in the spin-ladder compound Na2Fe2(C2O4)(3)(H2O)(2)
H. Yamaguchi; Y. Nakagawa; T. Kashiwagi; S. Kimura; Z. Honda; K. Kindo; M. Hagiwara
YAMADA CONFERENCE LX ON RESEARCH IN HIGH MAGNETIC FIELDS, Volume：51, First page：191, Last page：+, 2006
We have performed high field magnetization and multi-frequency electron spin resonance (ESR) measurements on single crystal and powder samples of Na2Fe2(C2O4)(3)(H2O)(2), abbreviated as SIO. The Fe2+ ions in SIO are bridged by oxalate groups to make two-leg ladders. The temperature dependence of magnetic susceptibilities parallel and perpendicular to the leg direction show very different and anisotropic behavior. Experimental results of the isomorphous compound Na2CO2(C2O4)(3)(H2O)(2) (SCO) are well explained by isolated magnetic dimers with an Ising-type anisotropy. Therefore, we analyze the frequency dependence of the ESR resonance fields by the same model with a fictitious spin 1 as in SCO. The agreement between experiment and calculation is satisfactorily good. Magnetic susceptibility and magnetization curves calculated with the same parameters obtained in the ESR analyses, however, do not agree well with the experimental ones. This indicates the presence of the exchange interaction between the dimers, namely the interaction along the leg.
IOP PUBLISHING LTD, English
DOI：https://doi.org/10.1088/1742-6596/51/1/044
DOI ID：10.1088/1742-6596/51/1/044, ISSN：1742-6588, Web of Science ID：WOS:000246201000044 - Magnetic field-induced second transition of the Haldane-gap antiferromagnet Ni(C5H14N2)(2)N-3(PF6)
H. Tsujii; Z. Honda; B. Andraka; K. Katsumata; Y. Takano
LOW TEMPERATURE PHYSICS, PTS A AND B, Volume：850, First page：1045, Last page：+, 2006
We have used the magnetocaloric effect to investigate the new transition that was recently discovered in the Haldane-gap antiferromagnet Ni(C5H14N2)(2)N-3(PF6) at H-c2 approximate to 14 T and at temperatures below 0.886 K. According to the specific-heat data in which this transition was observed in a magnetic field applied in the spin-chain direction, H,2 is nearly temperature-independent. Measured as a function of magnetic field, the variation of the sample temperature due to the magnetocaloric effect indicates that the transition at H,,2 is second order. It also shows that the magnetization of the new phase above H,2 decreases with increasing temperature, whereas it decreases with increasing temperature in the previously known, commensurate phase below H-c2. We propose the relevance of the Tomonaga-Luttinger spin liquid or the weak in-plane anisotropy of Ni(C5H14N2)(2)N-3(PF6) to the new phase.
AMER INST PHYSICS, English
ISSN：0094-243X, Web of Science ID：WOS:000243396400470 - The magnetic property of a uniaxial spin-ladder material Na2Fe2(C2O4)(3)(H2O)(2)
A Kikkawa; K Katsumata; Z Honda; K Yamada
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, Volume：74, Number：10, First page：2687, Last page：2690, Oct. 2005
Magnetic Susceptibility, magnetization and heat capacity measurements are made on a single crystal ;sample of a spin-ladder material, Na2Fe2(C2O4)(3)(H2O)(2). The susceptibilities show a broad maximum at a temperature of about 25 K and 20 K parallel (chi(vertical bar vertical bar)) and perpendicular (chi(perpendicular to)) to the ladder direction, respectively. The maximum value of chi(vertical bar vertical bar) is about three times larger than that of chi(perpendicular to). Both chi(vertical bar vertical bar) and X-perpendicular to decrease steeply at low temperatures down to about 5 K, at which chi(vertical bar vertical bar) shows an upturn. We find a broad peak in the temperature dependence of the heat capacity. Susceptibility, magnetization and heat capacity data are used to construct the magnetic field versus temperature phase diagram of this compound. Quantum fluctuations are not strong enough to form a singlet ground-state, probably due to the presence of Ising anisotropy. The actual ground state is expected to be close to the quantum critical-point between the spin-gapped and a Neel ordered phases with the help of the inter-ladder interaction.
PHYSICAL SOC JAPAN, English
DOI：https://doi.org/10.1143/JPSJ.74.2687
DOI ID：10.1143/JPSJ.74.2687, ISSN：0031-9015, CiNii Articles ID：110002250635, Web of Science ID：WOS:000233537600011 - 19pXH-10 Neutron Scattering Study in a Spin Ladder Compound Na_2Co_2(C_2O_4)_3(H_2O)_2
Matsuda M.; Wakimoto S.; Kakurai K.; Honda Z.
Meeting abstracts of the Physical Society of Japan, Volume：60, Number：2, First page：287, Last page：287, 19 Aug. 2005
The Physical Society of Japan (JPS), Japanese
ISSN：1342-8349, CiNii Articles ID：110004538564, CiNii Books ID：AA11439205 - Thermodynamic properties in the approach to the quantum critical point of the spin-ladder material Na2Co2(C2O4)(3)(H2O)(2)
Z Honda; K Katsumata; A Kikkawa; K Yamada
PHYSICAL REVIEW LETTERS, Volume：95, Number：8, First page：087204 1-4, Aug. 2005
Magnetic susceptibility and heat capacity measurements as a function of temperature on a single-crystal sample of a spin-ladder material, Na2Co2(C2O4)(3)(H2O)(2), are reported. Principal susceptibilities, parallel and perpendicular to the ladder direction, respectively, show broad maxima around 22 and 17 K. Both susceptibilities decay exponentially down to about 5 K and thereafter they are essentially independent of temperature. These findings amount to a signature of a quantum phase transition from a spin-liquid to Neel ordered state previously predicted theoretically. No anomaly is found in the heat capacity around the transition temperature.
AMER PHYSICAL SOC, English
DOI：https://doi.org/10.1103/PhysRevLett.95.087204
DOI ID：10.1103/PhysRevLett.95.087204, ISSN：0031-9007, eISSN：1079-7114, Web of Science ID：WOS:000231310900061 - Orbital and magnetic ordering in La0.5Sr1.5MnO4 studied by soft X-ray resonant scattering
U Staub; Scagnoli, V; AM Mulders; K Katsumata; Z Honda; H Grimmer; M Horisberger; JM Tonnerre
PHYSICAL REVIEW B, Volume：71, Number：21, First page：214421 1-5, Jun. 2005
Orbital and magnetic ordering in La0.5Sr1.5MnO4 have been studied with resonant soft x-ray scattering at the Mn L-2,L-3 edges and for the first time azimuthal angle scans and polarization analysis are presented. The azimuthal angle dependencies are well described by the occurrence of a quadrupole (orbital) ordering below T-OO and an additional dipole (magnetic) contribution below T-N. There are no indications that there is an enhanced Jahn-Teller distortion at T-N as reported in a previous study. Subsequently, it is shown that there is simultaneous ferro- and antiferromagnetic ordering along the c-direction.
AMERICAN PHYSICAL SOC, English
DOI：https://doi.org/10.1103/PhysRevB.71.214421
DOI ID：10.1103/PhysRevB.71.214421, ISSN：1098-0121, Web of Science ID：WOS:000230276600058 - Orbital and magnetic ordering in La0.5Sr1.5MnO4 studied by soft X-ray resonant scattering
U Staub; Scagnoli, V; AM Mulders; K Katsumata; Z Honda; H Grimmer; M Horisberger; JM Tonnerre
PHYSICAL REVIEW B, Volume：71, Number：21, First page：214421 1-5, Jun. 2005
Orbital and magnetic ordering in La0.5Sr1.5MnO4 have been studied with resonant soft x-ray scattering at the Mn L-2,L-3 edges and for the first time azimuthal angle scans and polarization analysis are presented. The azimuthal angle dependencies are well described by the occurrence of a quadrupole (orbital) ordering below T-OO and an additional dipole (magnetic) contribution below T-N. There are no indications that there is an enhanced Jahn-Teller distortion at T-N as reported in a previous study. Subsequently, it is shown that there is simultaneous ferro- and antiferromagnetic ordering along the c-direction.
AMERICAN PHYSICAL SOC, English
DOI：https://doi.org/10.1103/PhysRevB.71.214421
DOI ID：10.1103/PhysRevB.71.214421, ISSN：1098-0121, Web of Science ID：WOS:000230276600058 - 24aYP-1 High-field magnetization of an S=l/2 antiferromagnetic chain compound:LiCu_2O_2
Narumi Y.; Honda Z.; Kindo K.; Hagiwara M.
Meeting abstracts of the Physical Society of Japan, Volume：60, Number：1, First page：409, Last page：409, 04 Mar. 2005
The Physical Society of Japan (JPS), Japanese
ISSN：1342-8349, CiNii Articles ID：110004535691, CiNii Books ID：AA11439205 - Half-ordered state in the anisotropic Haldane-gap antiferromagnet Ni(C5D14N2)(2)N-3(PF6)
A Zheludev; B Grenier; E Ressouche; LP Regnault; Z Honda; K Katsumata
PHYSICAL REVIEW B, Volume：71, Number：10, First page：104418 1-4, Mar. 2005
Neutron diffraction experiments performed on the Haldane gap material Ni(C5D14N2)(2)N-3(PF6) in high magnetic fields applied at an angle to the principal anisotropy axes reveal two consecutive field-induced phase transitions. The low-field phase is the gapped Haldane state, while at high fields the system exhibits a three-dimensional long-range Neel order. In a peculiar phase found in intermediate fields only half of all the spin chains participate in the long-range ordering, while the other half remain disordered and gapped.
AMERICAN PHYSICAL SOC, English
DOI：https://doi.org/10.1103/PhysRevB.71.104418
DOI ID：10.1103/PhysRevB.71.104418, ISSN：1098-0121, Web of Science ID：WOS:000228065400054 - フラストレーション系低次元磁性体における量子効果の解明
本多善太郎
Volume：平成16年度, 2005 - Generation of Functional Biomolecules By Evolutionary Molecular Engineering
MD. Salimullah
Volume：6, First page：83, Last page：83, 2005
Japanese
DOI：https://doi.org/10.1016/j.jallcom.2006.01.101
DOI ID：10.1016/j.jallcom.2006.01.101, ISSN：1347-4758, CiNii Articles ID：120001371347 - フラストレーション系低次元磁性体における量子効果の解明
本多善太郎
総合研究機構研究プロジェクト研究成果報告書, Volume：平成16年度, 2005 - Magneto-trans port study on Ni1-xMnx (0.23 < x < 0.3) in High Fields up to 30T
K Yamada; Z Honda; JL Luo; T Okazaki
PRICM 5: THE FIFTH PACIFIC RIM INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS AND PROCESSING, PTS 1-5, Volume：475-479, First page：2189, Last page：2192, 2005
Giant negative magnetoresistance (MR) up to 15% were observed for nano-scaled grains of Ni1-xMnx(0.23 < x < 0.3) in high fields up to 30 T. The crystal grain size (approximate to 5nm) was obtained by an adequate annealing condition of 630 K, 200hrs. The sample resistance decreased linearly with magnetization increases in each magnetization range for different x, and decreased with the same slope even for different x. The observed negative MR is plausibly explained by the scattering of carriers by the anti-parallel spin pairs of residual Mn-Mn clusters.
TRANS TECH PUBLICATIONS LTD, English
ISSN：0255-5476, Web of Science ID：WOS:000227494702125 - High-field phase diagram of the Haldane-gap antiferromagnet Ni(C5H14N2)(2)N-3(PF6)
H Tsujii; Z Honda; B Andraka; K Katsumata; Y Takano
PHYSICAL REVIEW B, Volume：71, Number：1, First page：014426 1-6, Jan. 2005
We have determined the magnetic phase diagram of the quasi-one-dimensional S=1 Heisenberg antiferromagnet Ni(C5H14N2)(2)N-3(PF6) by specific heat measurements to 150 mK in temperature and 32 T in the magnetic field. When the field is applied along the spin-chain direction, a new phase appears at H(c2)approximate to14 T. For the previously known phases of field-induced order, an accurate determination is made of the power-law exponents of the ordering temperature near the zero-temperature critical field H-c, owing to the four-fold improvement of the minimum temperature over the previous work. The results are compared with the predictions based on the Bose-Einstein condensation of triplet excitations. Substituting deuterium for hydrogen is found to slightly reduce the interchain exchange.
AMERICAN PHYSICAL SOC, English
DOI：https://doi.org/10.1103/PhysRevB.71.014426
DOI ID：10.1103/PhysRevB.71.014426, ISSN：1098-0121, Web of Science ID：WOS:000226735100106 - 高速分子進化による高機能バイオ分子の創出（埼玉バイオプロジェクト）
西垣功一; 北村幸一郎; 高橋―本多陽子; 木下保則; 吉田昼也; MD.Salimullah; 鈴木美穂; 内田秀和; 勝部昭明
埼玉大学地域共同研究センター紀要, Volume：6, First page：83, Last page：83, 2005
Japanese
DOI：https://doi.org/10.1016/j.jallcom.2006.01.101
DOI ID：10.1016/j.jallcom.2006.01.101, ISSN：1347-4758, CiNii Articles ID：120001371347 - Search for orbitons in LaMnO3, YTiO3 and KCuF3 using high-resolution inelastic x-ray scattering
Y Tanaka; AQR Baron; YJ Kim; KJ Thomas; JP Hill; Z Honda; F Iga; S Tsutsui; D Ishikawa; CS Nelson
NEW JOURNAL OF PHYSICS, Volume：6, First page：161, Last page：172, Nov. 2004
Orbital excitations have been sought in three systems, LaMnO3, KCuF3 andYTiO(3), using high-resolution inelastic x-ray scattering, with an energy resolution of 6 meV. Motivated by the recent Raman scattering result of Saitoh et al (2001 Nature 410 180), we measured the energy transfer spectra of LaMnO3 in the energy range up to 200 meV. We did not find any signal above background that could be associated with orbiton excitations. Since significant interaction between the spin and orbital degrees of freedom is expected in KCuF3 andYTiO(3), energy spectra were measured above and below the respective magnetic ordering temperature. We were not able to detect any change in the excitation spectra due to the magnetic ordering temperature of these materials. We discuss the implications of the experimental findings and estimate an upper bound on the orbiton x-ray cross-section.
IOP PUBLISHING LTD, English
DOI：https://doi.org/10.1088/1367-2630/6/1/161
DOI ID：10.1088/1367-2630/6/1/161, ISSN：1367-2630, Web of Science ID：WOS:000224964000010 - 12aWG-4 Magnetic properties of spinel oxide Li(Mn_1-xCr_x)_2O_4
Katori H.; Honda Z.; Yamada K.; Takagi H.
Meeting abstracts of the Physical Society of Japan, Volume：59, Number：2, First page：337, Last page：337, 25 Aug. 2004
The Physical Society of Japan (JPS), Japanese
ISSN：1342-8349, CiNii Articles ID：110002052857, CiNii Books ID：AA11439205 - An electron spin resonance study of magnetic excitations in the quantum antiferromagnet Ni(C5H14N2)(2)N-3(PF6)
Z Honda; M Hagiwara; K Katsumata; K Yamada
JOURNAL OF APPLIED PHYSICS, Volume：95, Number：11, First page：7543, Last page：7544, Jun. 2004
We report the results of electron spin resonance (ESR) measurements on single crystals of the spin 1 quasi-one-dimensional Heisenberg antiferromagnet Ni(C5H14N2)(2)N-3(PF6) in the high-field phase. We observed ESR transitions from the ground state with a q=pi component above the critical field H-c. The experimental results are analyzed using the energy level scheme that is widely accepted for the spin 1 one-dimensional Heisenberg antiferromagnet below H-c. (C) 2004 American Institute of Physics.
AMER INST PHYSICS, English
DOI：https://doi.org/10.1063/1.1652413
DOI ID：10.1063/1.1652413, ISSN：0021-8979, Web of Science ID：WOS:000221657900337 - Gmr and soft magnetic properties of Ni-Mn alloys with dispersed ferromagnetic nano particles
T Okazaki; T Miyanaga; Y Sakisaka; S Sugimoto; K Yamada; Z Honda
REVIEWS ON ADVANCED MATERIALS SCIENCE, Volume：6, Number：2, First page：150, Last page：161, May 2004
GMR and soft magnetic properties were investigated in nano-scale inhomogeneous Ni1-xMnx alloys (x = 0.20similar to0.30), where ordered single-domain particles are distributed in disordered nonmagnetic or Ni-rich or Mn-rich matrices. The GMR of Ni3Mn alloy depends on the volume fraction of ordered domains E:. Maximum value of -1.8% is obtained at epsilon similar to 0.2. Moreover, the GMR depends remarkably on x: GMR for 0.20 less than or equal to x less than or equal to 0.24 is small (Type I) and for 0.26 less than or equal to x less than or equal to 0.30 has a maximum of -6% at x = 0.30 (Type II). Types I and II are caused respectively by ferromagnetic and antiferromagnetic interactions between domains.
INST PROBLEMS MECHANICAL ENGINEERING-RUSSIAN ACADEMY SCIENCES, English
ISSN：1606-5131, Web of Science ID：WOS:000226120800007 - A magnetization plateau in a kagome antiferromagnet
Y Narumi; Z Honda; K Katsumata; JC Domenge; P Sindzingre; C Lhuillier; A Matsuo; K Suga; K Kindo
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, Volume：272, First page：878, Last page：879, May 2004
We have made magnetization measurements under pulsed magnetic fields on a S =1/2 kagome antiferromagnet [Cu-3(titmb)(2)(OCOCH3)(6)](.) H2O. A magnetization plateau with one-third of the saturation moment has been observed in a certain range of field sweep rates at 100 mK. This transient phenomenon of the magnetization is analyzed using an exact diagonalization method and found to be due to the meta-stable states originating from frustration. (C) 2003 Elsevier B.V. All rights reserved.
ELSEVIER SCIENCE BV, English
DOI：https://doi.org/10.1016/j.jmmm.2003.12.1225
DOI ID：10.1016/j.jmmm.2003.12.1225, ISSN：0304-8853, Web of Science ID：WOS:000222236700055 - Observation of a transient magnetization plateau in a quantum antiferromagnet on the Kagome lattice
Y Narumi; K Katsumata; Z Honda; JC Domenge; P Sindzingre; C Lhuillier; Y Shimaoka; TC Kobayashi; K Kindo
EUROPHYSICS LETTERS, Volume：65, Number：5, First page：705, Last page：711, Mar. 2004
The magnetization process of an S = 1/2 antiferromagnet on the Kagome lattice, [Cu-3(titmb)(2)(OCOCH3)(6)] . H2O{titmb = 1, 3, 5-tris(imidazol-1-ylmethyl)-2.4.6 trimethyl-benzene}, has been measured at very low temperature's in both pulsed and steady fields. We have found a new dynamical behavior in the magnetization process. A plateau at one third of the saturation magnetization M-s appears in the pulsed-field experiments for intermediate sweep rates of the magnetic field and disappears in the steady-field experiment's. A theoretical analysis using exact diagonalization yields J(1) = 19+/-2 K and J(2) = 6+/-2 K. for the nearest-neighbor and second-nearest-neighbor interactions. respectively. This set of exchange parameters explains the very low saturation field and the absence of the plateau in the thermodynamic equilibrium as well as the two-peak feature in the magnetic heat. capacity observed by Honda et. al. (Z. Honda et al., J. Phys. Condens. Matter. 14 (2002) L625). Supported by numerical results we argue that a dynamical order by disorder phenomenon could explain the transient appearance of the M-s/3 plateau in pulsed-field experiments.
E D P SCIENCES, English
DOI：https://doi.org/10.1209/epl/i2003-10164-5
DOI ID：10.1209/epl/i2003-10164-5, ISSN：0295-5075, Web of Science ID：WOS:000225736900019 - Formation of Eu2+ in SiO2-Al2O3 glass during thermal treatment in sol-gel process
N Kamata; K Tosaka; Z Honda; K Yamada
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS, Volume：43, Number：3A, First page：L372, Last page：L374, Mar. 2004
Although the Eu ion in a glass matrix is most stable in its trivalent form Eu3+, we found that a distinct blue photoluminescence (PL) from Eu2+ in Eu-doped SiO2-Al2O3 glasses was obtained without any deoxidizing treatments after a conventional sol-gel process. The incorporation of Al in a correct proportion to the concentration of Eu is essential for stabilizing Eu2+ during thermal treatment in the process. In order to understand the effect of the thermal treatment, we combined the result of thermal analysis with that of PL as a function of heating temperature. The PL spectral change from the defect-originated emission to the blue emission due to Eu2+ occurred at the temperature between 400degreesC and 600degreesC. An exothermic peak was observed at 450degreesC using our differential scanning calorimeter. We concluded that the reduction of Eu3+ and the stabilization of the resultant Eu2+ in the glass network takes place at the temperature around 450degreesC.
INST PURE APPLIED PHYSICS, English
DOI：https://doi.org/10.1143/JJAP.43.L372
DOI ID：10.1143/JJAP.43.L372, ISSN：0021-4922, CiNii Articles ID：10012705011, Web of Science ID：WOS:000224780700017 - Dynamics of an anisotropic Haldane antiferromagnet in a strong magnetic field
A Zheludev; SM Shapiro; Z Honda; K Katsumata; B Grenier; E Ressouche; LP Regnault; Y Chen; P Vorderwisch; HJ Mikeska; AK Kolezhuk
PHYSICAL REVIEW B, Volume：69, Number：5, First page：054414 1-10, Feb. 2004
We report the results of elastic and inelastic neutron-scattering experiments on the Haldane-gap quantum antiferromagnet Ni(C5D14N2)(2)N-3(PF6) performed at mK temperatures in a wide range of magnetic field applied parallel to the S=1 spin chains. Even though this geometry is closest to an ideal axially symmetric configuration, the Haldane gap closes at the critical field H(c)similar or equal to4 T, but reopens again at higher fields. The field dependence of the two lowest magnon modes is experimentally studied and the results are compared with the predictions of several theoretical models. We conclude that of several existing theories, only the recently proposed model [Zheludev , cond-mat/0301424] is able to reproduce all the features observed experimentally for different field orientations.
AMER PHYSICAL SOC, English
DOI：https://doi.org/10.1103/PhysRevB.69.054414
DOI ID：10.1103/PhysRevB.69.054414, ISSN：2469-9950, eISSN：2469-9969, Web of Science ID：WOS:000220001700048 - Dynamics of an anisotropic Haldane antiferromagnet in a strong magnetic field
A Zheludev; SM Shapiro; Z Honda; K Katsumata; B Grenier; E Ressouche; LP Regnault; Y Chen; P Vorderwisch; HJ Mikeska; AK Kolezhuk
PHYSICAL REVIEW B, Volume：69, Number：5, First page：054414 1-10, Feb. 2004
We report the results of elastic and inelastic neutron-scattering experiments on the Haldane-gap quantum antiferromagnet Ni(C5D14N2)(2)N-3(PF6) performed at mK temperatures in a wide range of magnetic field applied parallel to the S=1 spin chains. Even though this geometry is closest to an ideal axially symmetric configuration, the Haldane gap closes at the critical field H(c)similar or equal to4 T, but reopens again at higher fields. The field dependence of the two lowest magnon modes is experimentally studied and the results are compared with the predictions of several theoretical models. We conclude that of several existing theories, only the recently proposed model [Zheludev , cond-mat/0301424] is able to reproduce all the features observed experimentally for different field orientations.
AMER PHYSICAL SOC, English
DOI：https://doi.org/10.1103/PhysRevB.69.054414
DOI ID：10.1103/PhysRevB.69.054414, ISSN：2469-9950, eISSN：2469-9969, Web of Science ID：WOS:000220001700048 - Fabrication of blue-emitting sol-gel glasses with Eu2+ ions
Kamata, Norihiko; Honda, Zentaro; Yamada, Koji
Volume：37, First page：15, Last page：19, 2004 - NDMAP: the best material to study the Haldane's prediction
K Katsumata; Z Honda
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, Volume：65, Number：1, First page：51, Last page：54, Jan. 2004
As predicted by Haldane, spin, S = 1 one-dimensional (1D) Heisenberg antiferromagnet (HAF) has an energy gap between the singlet ground state and first excited triplet. On application of magnetic field, the triplet state Zeeman splits and the energy of one of the triplet state becomes zero at a critical field, H-c. Above H-c the system recovers magnetism. Then, we expect that a quasi-1D HAF will show a magnetic long-range ordering (LRO) at low temperatures due to the inter-chain coupling. This field-induced LRO has not been observed before due to complication of the-crystal structure in the materials studied so far and/or technical difficulty.
From a heat capacity measurement on a single crystal of an S = 1 quasi-Q1D HAF, Ni(C5H14N2)(2)N-3(PF6), we found an anomaly at a temperature in finite fields indicating a field-induced phase transition. A magnetic LRO is confirmed by a neutron diffraction measurement on the same sample. The temperature versus magnetic field phase diagram of this compound is constructed and discussed. (C) 2003 Elsevier Ltd. All rights reserved.
PERGAMON-ELSEVIER SCIENCE LTD, English
DOI：https://doi.org/10.1016/j.jpcs.2003.08.015
DOI ID：10.1016/j.jpcs.2003.08.015, ISSN：0022-3697, CiNii Articles ID：80016384876, Web of Science ID：WOS:000188127400008 - Fabrication of blue-emitting sol-gel glasses with Eu2+ ions
Kamata, Norihiko; Honda, Zentaro; Yamada, Koji
Saitama Daigaku Kiyo, Kogakubu, Volume：37, First page：15, Last page：19, 2004 - Magnetic properties of an S=1/2 ferro-antiferro-antiferromagnetic trimer chain
Hagiwara M.; Matsuo A.; Narumi Y.; Minami K.; Kindo K.; Kobayashi K.; Honda Z.
Meeting abstracts of the Physical Society of Japan, Volume：58, Number：2, First page：377, Last page：377, 15 Aug. 2003
The Physical Society of Japan (JPS), Japanese
ISSN：1342-8349, CiNii Articles ID：110002061036, CiNii Books ID：AA11439205 - An electron spin resonance study of magnetic excitations in the Haldane antiferromagnet NDMAP
Honda Z.; Hagiwara M.; Katsumata K.; Yamada K.
Meeting abstracts of the Physical Society of Japan, Volume：58, Number：2, First page：353, Last page：353, 15 Aug. 2003
The Physical Society of Japan (JPS), Japanese
ISSN：1342-8349, CiNii Articles ID：110002060847, CiNii Books ID：AA11439205 - The spin gap in a quantum antiferromagnet on the kagome lattice
Z Honda; K Katsumata; K Yamada
JOURNAL OF PHYSICS-CONDENSED MATTER, Volume：14, Number：38, First page：L625, Last page：L629, Sep. 2002
A new spin S = 1/2 antiferromagnet on the kagome lattice, [Cu-3(titmb)(2) (OCOCH3)(6)].H2O (titmb = 1 3, 5-tris(imidazol-1-ylmethyl)-2, 4, 6 trimethylbenzene), has been grown and its magnetic properties have been studied. We have found for the first time a two-peak feature in the temperature dependence of the heat capacity. The higher-temperature peak is explained as due to a short-range magnetic ordering in two dimensions. We analysed the lower-temperature peak on the basis of an energy level scheme with a singlet ground state and a spin gap to the first excited triplet. The analysis reproduces the experiment fairly well, suggesting that the ground state is a disordered quantum liquid.
IOP PUBLISHING LTD, English, Report scientific journal
ISSN：0953-8984, Web of Science ID：WOS:000178678400001 - ESR in LiMn_2O_4
Hagiwara M.; Tuchendler J.; Honda Z.; Katsumata K.
Meeting abstracts of the Physical Society of Japan, Volume：57, Number：2, First page：342, Last page：342, 13 Aug. 2002
The Physical Society of Japan (JPS), Japanese
ISSN：1342-8349, CiNii Articles ID：110009718218, CiNii Books ID：AA11439205 - Low-temperature high-field magnetization measurement on a quantum spin chain
Z Honda; K Katsumata; Y Narumi; K Kindo; H Hori
PHYSICA B, Volume：284, First page：1587, Last page：1588, Jul. 2000
We report the result of magnetization (III) measurements at low temperatures down to 80 mK and high magnetic fields (H) up to 60 T on the S = 1 quasi-one-dimensional Heisenberg antiferromagnetic compound Ni(C5H14N2)(2)N-3(PF6) which shows a field-induced long-range ordering (LRO) at low temperatures. The experimental M-H curve is in reasonably good agreement with theoretical one. No indication of field-induced LRO is detected in the magnetization measurement. (C) 2000 Elsevier Science B.V. All rights reserved.
ELSEVIER SCIENCE BV, English
ISSN：0921-4526, Web of Science ID：WOS:000087423100232 - Temperature-magnetic field dependence of the magnetization in the S=1 Quasi-One-Dimensional Heisenberg Antiferromagnet NDMAP
Honda Z.; Katori H.Aruga; Katsumata K.
Meeting abstracts of the Physical Society of Japan, Volume：55, Number：1, First page：370, Last page：370, 10 Mar. 2000
The Physical Society of Japan (JPS), Japanese
ISSN：1342-8349, CiNii Articles ID：110001911800, CiNii Books ID：AA11439205 - Observation of the Quantum Energy Gap in a Quasi-two-dimentional Tetragonal Antiferromagnet by ESR Techinique
Hagiwara M.; Katsumata K.; Honda Z.; Satooka J.; Birgeneau R. J.; Chou F. C.; Lee Y. S.; Aharony A.; Entin-Wohlman O.; Harris A. B.
Meeting abstracts of the Physical Society of Japan, Volume：55, Number：1, First page：535, Last page：535, 10 Mar. 2000
The Physical Society of Japan (JPS), Japanese
ISSN：1342-8349, CiNii Articles ID：110001913838, CiNii Books ID：AA11439205 - 25pYQ-5 One and Three dimentional magnetic exciations in the field induced long range ordered phase of a Haldane material
Honda Z; Hagiwara M; Tokunaga M; Katsumata K
Meeting abstracts of the Physical Society of Japan, Volume：54, Number：2, First page：387, Last page：387, 03 Sep. 1999
The Physical Society of Japan (JPS), Japanese
ISSN：1342-8349, CiNii Articles ID：110002065191, CiNii Books ID：AA11439205 - Magnetic field versus temperature phase diagram of a quasi-one-dimensional S = 1 heisenberg antiferromagnet
Z. Honda; H. Asakawa; K. Katsumata
Physical Review Letters, Volume：81, Number：12, First page：2566, Last page：2569, 21 Sep. 1998
From a heat capacity (Cp) measurement on a single crystal sample of the S = 1 quasi-one-dimensional (Q1D) Heisenberg antiferromagnet (HAF) Ni(C5 H14 N2)2 N3 (PF6) in applied magnetic fields, we found an anomaly which is indicative of a magnetic long-range ordering. We were able to follow how the position of the anomaly in CP changes with temperature (T) and magnetic field (H). An experimental H − T phase diagram of an S = 1 Q1D HAF is obtained and compared with that of the corresponding classical system. © 1998 American Physical Society.
English
DOI：https://doi.org/10.1103/PhysRevLett.81.2566
DOI ID：10.1103/PhysRevLett.81.2566, ISSN：1079-7114, CiNii Articles ID：120001371167, SCOPUS ID：34250690000 - ESR measurement on the Haldane magnet Ni(C_5H_<14>N_2)_2N_3(PF_6)
HONDA Z.; HAGIWARA M.; KATSUMATA K.
Meeting abstracts of the Physical Society of Japan, Volume：53, Number：2, First page：589, Last page：589, 05 Sep. 1998
The Physical Society of Japan (JPS), Japanese
ISSN：1342-8349, CiNii Articles ID：110001983694, CiNii Books ID：AA11439205 - Magnetic field versus temperature phase diagram of a quasi-one-dimensional S=1 Heisenberg antiferromagnet
Z Honda; H Asakawa; K Katsumata
PHYSICAL REVIEW LETTERS, Volume：81, Number：12, First page：2566, Last page：2569, Sep. 1998
From a heat capacity (C-p) measurement on a single crystal sample of the S = 1 quasi-one-dimensional(Q1D) Heisenbeg antiferromagnet (HAF) Ni(C5H14N2)(2)N-3(PF6) in applied magnetic fields, we found an anomaly which is indicative of a magnetic long-range ordering. We were able to follow how the position of the anomaly in C-p changes with temperature (T) and magnetic field (H). An experimental H-T phase diagram of an S = 1 Q1D HAF is obtained and compared with that of the corresponding classical system. [S0031-9007(98)07105-1].
AMERICAN PHYSICAL SOC, English
DOI：https://doi.org/10.1103/PhysRevLett.81.2566
DOI ID：10.1103/PhysRevLett.81.2566, ISSN：0031-9007, CiNii Articles ID：120001371167, Web of Science ID：WOS:000076073100042 - Z. Honda, H. Asakawa and K. Katsumata, “Magnetic Field versus Temperature Phase Diagram of a Quasi-One-Dimensional S=1 Heisenberg Antiferromagnet”, Phys. Rev. Lett. 81, 2566（1998）.
1998 - Z. Honda, H. Asakawa and K. Katsumata, “Magnetic Field versus Temperature Phase Diagram of a Quasi-One-Dimensional S=1 Heisenberg Antiferromagnet”, Phys. Rev. Lett. 81, 2566（1998）.
1998 - Specific Heat of Ferromagnetic and Antiferromagnetic Alternating Chains (CH3)2CHNH3CuCl3 under Magnetic Fields.
真中浩貴; 山田勲; 本多善太郎; 香取浩子; 勝又紘一
日本物理学会講演概要集(分科会), Volume：1997, 1997
J-Global ID：200902154871899729
- C. Berthier, L. P. Lévy, and G. Martinez, Eds. High Magnetic Fields - applications in condensed matter physics and spectroscopy
2001 - C. Berthier, L. P. Lévy, and G. Martinez, Eds. High Magnetic Fields - applications in condensed matter physics and spectroscopy
Springer Verlag, 2001
- スピネル化合物GeFe2O4の磁性
2009 - 量子スピン系における新奇相転移の研究
2009 - 量子磁性体の極低温強磁場多周波ESR-II
2009 - スピンラダー物質Na2Fe2(C2O4)3(H2O)2の中性子散乱
2009 - 静電塗布法による青色領域に選択的に感度を有する有機撮像素子
2009 - スピネル化合物GeFe2O4の磁性
日本物理学会講演概要集, 2009 - 量子スピン系における新奇相転移の研究
日本物理学会講演概要集, 2009 - 量子磁性体の極低温強磁場多周波ESR-II
日本物理学会講演概要集, 2009 - スピンラダー物質Na2Fe2(C2O4)3(H2O)2の中性子散乱
日本物理学会講演概要集, 2009 - 静電塗布法による青色領域に選択的に感度を有する有機撮像素子
電子情報通信学会2009年総合大会概要集, 2009 - Organic Photoconductive Device Fabricated by Electrospray Deposition Method
2008 - 低次元構造を有する金属錯体の合成と磁性
2008 - ゾルゲルガラス封止したEu錯体を用いた波長変換型太陽電池
2008 - 静電塗布法で作製した単層型有機撮像素子
2008 - LiをインターカレートしたS=1/2スピンラダーCu(A)X2の磁性
2008 - 量子磁性体の極低温強磁場多周波ESR
2008 - ゾルゲル法を用いたシリカガラス被覆Eu錯体のナノサイズ化
2008 - ホランダイト型a-MnO2のイオン吸着と磁性変化
2008 - Multi-frequency ESR in the Haldane magnet NDMAP below 1 K
2008 - Spin excitations in the field induce phase of the quasi-one-dimensional S=1 Heisenberg antiferromagnet NDMAP
2008 - オープントンネルホランダイトa-MnO2の磁性
2008 - スピネル磁性体LiCrMnO4の中性子散乱
2008 - ハルデン磁性体NDMAPにおける磁場誘起相での新奇なスピン励起 II
2008 - Organic Photoconductive Device Fabricated by Electrospray Deposition Method
The 8th International Conference on Nano-Molecular Electronics proceedings, 2008 - 低次元構造を有する金属錯体の合成と磁性
2008 - ゾルゲルガラス封止したEu錯体を用いた波長変換型太陽電池
第56回応用物理学会関係連合講演会予稿集, 2008 - 静電塗布法で作製した単層型有機撮像素子
第56回応用物理学会関係連合講演会予稿集, 2008 - LiをインターカレートしたS=1/2スピンラダーCu(A)X2の磁性
日本物理学会講演概要集, 2008 - 量子磁性体の極低温強磁場多周波ESR
日本物理学会講演概要集, 2008 - ゾルゲル法を用いたシリカガラス被覆Eu錯体のナノサイズ化
第56回応用物理学会関係連合講演会予稿集, 2008 - ホランダイト型a-MnO2のイオン吸着と磁性変化
第55回応用物理学会講演予稿集, 2008 - Multi-frequency ESR in the Haldane magnet NDMAP below 1 K
Journal of Physics: Conference Series, 2008 - Spin excitations in the field induce phase of the quasi-one-dimensional S=1 Heisenberg antiferromagnet NDMAP
EPR Symposium 2008 proceedings, 2008 - オープントンネルホランダイトa-MnO2の磁性
日本物理学会講演概要集, 2008 - スピネル磁性体LiCrMnO4の中性子散乱
日本物理学会講演概要集, 2008 - ハルデン磁性体NDMAPにおける磁場誘起相での新奇なスピン励起 II
日本物理学会講演概要集, 2008 - High-field Multi-Frequency ESR in the S=1 Quasi-One-Dimensional Antiferromagnets
2007 - S=1/2スピンラダーCu(A)X2, (X=Cl, Br)の磁場中比熱
2007 - カゴメ格子磁性体Cu-titmbの核と電子複合スピン系の磁気相転移
2007 - スピネル磁性体GeFe2O4の磁気構造
2007 - 一次元磁性体の共鳴磁場の温度依存性
2007 - S=1/2スピンラダーCu(Q)Cl2の磁場中比熱
2007 - ハルデン磁性体NDMAPの磁気励起の角度依存性
2007 - 梯子格子磁性体Na2Fe2(C2O4)3(H2O)2の磁化測定と多周波ESR III
2007 - スピンラダー物質Na2Fe2(C2O4)3(H2O)2のmSR測定
2007 - スピンラダー物質Na2(Fe0.5Co0.5)2(C2O4)3(H2O)2のmSR測定
2007 - High-field Multi-Frequency ESR in the S=1 Quasi-One-Dimensional Antiferromagnets
2007 - S=1/2スピンラダーCu(A)X2, (X=Cl, Br)の磁場中比熱
日本物理学会講演概要集, 2007 - カゴメ格子磁性体Cu-titmbの核と電子複合スピン系の磁気相転移
日本物理学会講演概要集, 2007 - スピネル磁性体GeFe2O4の磁気構造
日本物理学会講演概要集, 2007 - 一次元磁性体の共鳴磁場の温度依存性
日本物理学会講演概要集, 2007 - S=1/2スピンラダーCu(Q)Cl2の磁場中比熱
日本物理学会講演概要集, 2007 - ハルデン磁性体NDMAPの磁気励起の角度依存性
日本物理学会講演概要集, 2007 - 梯子格子磁性体Na2Fe2(C2O4)3(H2O)2の磁化測定と多周波ESR III
日本物理学会講演概要集, 2007 - スピンラダー物質Na2Fe2(C2O4)3(H2O)2のmSR測定
日本物理学会講演概要集, 2007 - スピンラダー物質Na2(Fe0.5Co0.5)2(C2O4)3(H2O)2のmSR測定
日本物理学会講演概要集, 2007 - 三角格子配置拮抗型スピンのマイクロ磁気 室温での応用を目指して
2006 - 新しいスピンラダー物質の磁性と相転移
2006 - ハルデン磁性体NDMAPにおける磁場誘起相での新奇なスピン励起
2006 - 梯子格子磁性体Na2Fe2(C2O4)3(H2O)2の磁化測定と多周波ESR II
2006 - スピンラダー物質Na2Co2(C2O4)3(H2O)2のmSR測定
2006 - S=1反強磁性スピン鎖NDMAPのNMRによる研究 II
2006 - 新しいスピンラダー物質 Na2Co2(C2O4)3(H2O)2における不純物効果
2006 - 梯子格子磁性体Na2Fe2(C2O4)3(H2O)2の磁化測定と多周波ESR
2006 - 三角格子配置拮抗型スピンのマイクロ磁気 室温での応用を目指して
日本ＡＥＭ学会ＭＡＧＤＡ特集号, 2006 - 新しいスピンラダー物質の磁性と相転移
日本物理学会講演概要集, 2006 - ハルデン磁性体NDMAPにおける磁場誘起相での新奇なスピン励起
日本物理学会講演概要集, 2006 - 梯子格子磁性体Na2Fe2(C2O4)3(H2O)2の磁化測定と多周波ESR II
日本物理学会講演概要集, 2006 - スピンラダー物質Na2Co2(C2O4)3(H2O)2のmSR測定
日本物理学会講演概要集, 2006 - S=1反強磁性スピン鎖NDMAPのNMRによる研究 II
日本物理学会講演概要集, 2006 - 新しいスピンラダー物質 Na2Co2(C2O4)3(H2O)2における不純物効果
日本物理学会講演概要集, 2006 - 梯子格子磁性体Na2Fe2(C2O4)3(H2O)2の磁化測定と多周波ESR
日本物理学会講演概要集, 2006 - Multi-frequency Electron Spin Resonance (ESR) in LiCu2O2
2005 - スピン１鎖NDMAPの新しい磁場誘起相
2005 - 梯子格子磁性体Na2Co2(C2O4)3(H2O)2の磁性
2005 - LiCuO2の多周波ＥＳＲＩＩ
2005 - 梯子格子磁性体Na2Co2(C2O4)3(H2O)2の強磁場磁化過程と多周波ＥＳＲ
2005 - 梯子格子磁性体Na2Co2(C2O$)3(H2O)2の中性子散乱
2005 - S=1反強磁性スピン鎖NDMAPのNMRによる研究
2005 - 一軸異方性を持つスピンラダー物質Na2Fe2(C2O4)3(H2O)2の磁性
2005 - High-field magnetization process of a pyrochlore compound Gd2Ti2O7
2005 - Magnetic field-induced second transition of the haldane-gap antiferromagnet Ni(C5H14N2)2N3(PF6)
2005 - Multi-frequency ESR in LiCu2O2
2005 - S=1/2量子スピン反強磁性鎖化合物LiCu2O2の強磁場磁化測定
2005 - LiCu2O2の多周波ESR
2005 - Multi-frequency Electron Spin Resonance (ESR) in LiCu2O2
Proceedings of Osaka University Asia Pacific Vietnam National University, Hanoi Forum 2005, 2005 - スピン１鎖NDMAPの新しい磁場誘起相
日本物理学会講演概要集, 2005 - 梯子格子磁性体Na2Co2(C2O4)3(H2O)2の磁性
日本物理学会講演概要集, 2005 - LiCuO2の多周波ＥＳＲＩＩ
日本物理学会講演概要集, 2005 - 梯子格子磁性体Na2Co2(C2O4)3(H2O)2の強磁場磁化過程と多周波ＥＳＲ
日本物理学会講演概要集, 2005 - 梯子格子磁性体Na2Co2(C2O$)3(H2O)2の中性子散乱
日本物理学会講演概要集, 2005 - S=1反強磁性スピン鎖NDMAPのNMRによる研究
日本物理学会講演概要集, 2005 - 一軸異方性を持つスピンラダー物質Na2Fe2(C2O4)3(H2O)2の磁性
日本物理学会講演概要集, 2005 - High-field magnetization process of a pyrochlore compound Gd2Ti2O7
Proceedings of 24th International Conference on Low Temperature Physics, 2005 - Magnetic field-induced second transition of the haldane-gap antiferromagnet Ni(C5H14N2)2N3(PF6)
Proceedings of 24th International Conference on Low Temperature Physics, 2005 - Multi-frequency ESR in LiCu2O2
Proceedings of Physical Phenomena at High Magnetic Fields V, 2005 - S=1/2量子スピン反強磁性鎖化合物LiCu2O2の強磁場磁化測定
日本物理学会講演概要集, 2005 - LiCu2O2の多周波ESR
日本物理学会講演概要集, 2005 - １次元コバルト酸化物BaCoO3の磁性及び不純物置換効果
2004 - スピネル型酸化物Li(Mn1-xCrx)2O4の磁性
2004 - ハルデン物質における磁場誘起秩序相と磁気励起
2004 - １次元コバルト酸化物BaCoO3の磁性及び不純物置換効果
日本物理学会講演概要集, 2004 - スピネル型酸化物Li(Mn1-xCrx)2O4の磁性
日本物理学会講演概要集, 2004 - ハルデン物質における磁場誘起秩序相と磁気励起
日本物理学会講演概要集, 2004