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KOBAYASHI Takuya
| Comprehensive Analysis Center for Science | Assistant Professor |
Researcher information
■ Field Of Study- Nanotechnology/Materials, Organic functional materials
- Natural sciences, Magnetism, superconductivity, and strongly correlated systems
■ Career
- Apr. 2022 - Present, Saitama University, Research and Development Bureau, Japan
- Apr. 2018 - Present, Saitama University, Graduate Schoo of Science and Engineering, Assistant Professor
■ Member History
Performance information
■ Paper- Pressure-induced topological changes in the Fermi surface of a two-dimensional molecular conductor
T. Kobayashi; K. Yoshimi; H. Ma; S. Sekine; H. Taniguchi; N. Matsunaga; A. Kawamoto; Y. Uwatoko
Physical Review Materials, Feb. 2025, [Reviewed], [Lead, Corresponding]
English, Scientific journal
DOI：https://doi.org/10.1103/PhysRevMaterials.9.L021801
DOI ID：10.1103/PhysRevMaterials.9.L021801, ORCID：177583305 - Pseudogap formation in organic superconductors
Shusaku Imajo; Takuya Kobayashi; Yuki Matsumura; Taiki Maeda; Yasuhiro Nakazawa; Hiromi Taniguchi; Koichi Kindo
Physical Review Materials, Volume：7, Number：12, First page：124803-1, Last page：124803-7, Dec. 2023, [Reviewed]
American Physical Society (APS), English, Scientific journal
DOI：https://doi.org/10.1103/physrevmaterials.7.124803
DOI ID：10.1103/physrevmaterials.7.124803, eISSN：2475-9953 - Antiferromagnetic ordering and estimation of the exchange interaction in the π-d system λ-(BEDSe-TTF)2FeCl4 studied using 13CNMR
Rikumaru Saito; Takuya Kobayashi; Hiromi Taniguchi; Shuhei Fukuoka; Atsushi Kawamoto
Physical Review B, Volume：108, Number：15, First page：155112-1, Last page：155112-8, Oct. 2023, [Reviewed]
American Physical Society (APS), English, Scientific journal
DOI：https://doi.org/10.1103/physrevb.108.155112
DOI ID：10.1103/physrevb.108.155112, ISSN：2469-9950, eISSN：2469-9969, ORCID：143988270, 共同研究・競争的資金等ID：27722048 - Role of hydrogen bonding in charge-ordered organic conductor α−(BEDT-TTF)2I3 probed by I127 nuclear quadrupole resonance
T. Kobayashi; Y. Kato; H. Taniguchi; T. Tsumuraya; K. Hiraki; S. Fujiyama
Physical Review B, Sep. 2023, [Reviewed], [Lead, Corresponding]
Scientific journal
DOI：https://doi.org/10.1103/PhysRevB.108.115108
DOI ID：10.1103/PhysRevB.108.115108, ORCID：141780678, 共同研究・競争的資金等ID：27722048 - Dynamics of ethylene groups and hyperfine interactions between donor and anion molecules in λ -type organic conductors studied by Ga69,71 -NMR spectroscopy
N. Yasumura; T. Kobayashi; H. Taniguchi; S. Fukuoka; A. Kawamoto
Physical Review B, Dec. 2022, [Reviewed], [Corresponding]
English, Scientific journal
DOI：https://doi.org/10.1103/PhysRevB.106.245103
DOI ID：10.1103/PhysRevB.106.245103, ORCID：124147015 - Antiferromagnetic ordering of organic Mott insulator λ−(BEDSe-TTF)2GaCl4
A. Ito; T. Kobayashi; D. P. Sari; I. Watanabe; Y. Saito; A. Kawamoto; H. Tsunakawa; K. Satoh; H. Taniguchi
Physical Review B, Volume：106, Number：4, Jul. 2022, [Reviewed], [Corresponding]
American Physical Society (APS), English, Scientific journal
DOI：https://doi.org/10.1103/PhysRevB.106.045114
DOI ID：10.1103/PhysRevB.106.045114, ISSN：2469-9950, eISSN：2469-9969, ORCID：115737432 - Relationship between electronic inhomogeneity and bandwidth in the organic conductor κ−(BEDT−TTF)2Cu[N(CN)2]I studied by C13 NMR spectroscopy
T. Kobayashi; A. Suzuta; A. Kawamoto
Physical Review B, Volume：105, Number：19, First page：195148, May 2022, [Reviewed], [Lead, Corresponding]
English, Scientific journal
DOI：https://doi.org/10.1103/PhysRevB.105.195148
DOI ID：10.1103/PhysRevB.105.195148, ORCID：113818990 - Magnetic state in the quasi-two-dimensional organic conductor l-(BEST)2FeCl4 and the path of π−d interaction
Rikumaru Saito; Youhei Iida; Takuya Kobayashi; Hiromi Taniguchi; Noriaki Matsunaga; Shuhei Fukuoka; Atsushi Kawamoto
Physical Review B, Volume：105, Number：16, First page：165115-1, Last page：165115-8, Apr. 2022, [Reviewed]
American Physical Society (APS), English, Scientific journal
DOI：https://doi.org/10.1103/physrevb.105.165115
DOI ID：10.1103/physrevb.105.165115, ISSN：2469-9950, eISSN：2469-9969, ORCID：111341232, 共同研究・競争的資金等ID：27722048 - Charge imbalance in λ−(BETS)2GaCl4 and their interplay with superconductivity
Olga Iakutkina; Ece Uykur; Takuya Kobayashi; Atsushi Kawamoto; Martin Dressel; Yohei Saito
Physical Review B, Volume：104, Number：4, Jul. 2021, [Reviewed]
American Physical Society (APS), English, Scientific journal
DOI：https://doi.org/10.1103/PhysRevB.104.045108
DOI ID：10.1103/PhysRevB.104.045108, ISSN：2469-9950, eISSN：2469-9969, ORCID：96604207 - Thermodynamic evidence for the formation of a Fulde-Ferrell-Larkin-Ovchinnikov phase in the organic superconductor λ−(BETS)2GaCl4
S. Imajo; T. Kobayashi; A. Kawamoto; K. Kindo; Y. Nakazawa
Physical Review B, Jun. 2021, [Reviewed]
Scientific journal
DOI：https://doi.org/10.1103/PhysRevB.103.L220501
DOI ID：10.1103/PhysRevB.103.L220501, ORCID：94792293 - Enhancement of electron correlations and spin density wave fluctuations of the organic superconductor λ−(BETS)2GaCl4 under pressure proved by C13 NMR
M. Sawada; A. Kawamoto; T. Kobayashi
Physical Review B, Volume：103, Number：4, Jan. 2021, [Reviewed], [Last]
American Physical Society ({APS}), English, Scientific journal
DOI：https://doi.org/10.1103/PhysRevB.103.045112
DOI ID：10.1103/PhysRevB.103.045112, ORCID：86679100 - Interacting electron spins in κ−(BEDT-TTF)2Cu[N(CN)2]I investigated by ESR spectroscopy
Lena Nadine Majer; Björn Miksch; Olga Iakutkina; Takuya Kobayashi; Atsushi Kawamoto; Martin Dressel
Physical Review B, Volume：102, Number：21, Dec. 2020, [Reviewed]
American Physical Society ({APS}), Scientific journal
DOI：https://doi.org/10.1103/PhysRevB.102.214430
DOI ID：10.1103/PhysRevB.102.214430, ISSN：2469-9950, eISSN：2469-9969, ORCID：85776705 - Selective observation of spin and charge dynamics in an organic superconductor λ−(BETS)2GaCl4 using Ga69,71 NMR measurements
T. Kobayashi; K. Tsuji; A. Ohnuma; A. Kawamoto
Physical Review B, Volume：102, First page：235131, Dec. 2020, [Reviewed], [Lead, Corresponding]
English, Scientific journal
DOI：https://doi.org/10.1103/PhysRevB.102.235131
DOI ID：10.1103/PhysRevB.102.235131, ORCID：85308268 - Charge disproportionation in the spin-liquid candidate κ−(ET)2Cu2(CN)3 at 6 K revealed by Cu63 NQR measurements
T. Kobayashi; Q.-P. Ding; H. Taniguchi; K. Satoh; A. Kawamoto; Y. Furukawa
Physical Review Research, Volume：2, Number：4, Oct. 2020, [Reviewed], [Lead, Corresponding]
American Physical Society ({APS}), English, Scientific journal
DOI：https://doi.org/10.1103/PhysRevResearch.2.042023
DOI ID：10.1103/PhysRevResearch.2.042023, ORCID：82739443 - Unconventional superconductivity in λ -(BETS) 2GaCl4 probed by C13 NMR
T. Kobayashi; H. Taniguchi; A. Ohnuma; A. Kawamoto
Physical Review B, Sep. 2020, [Reviewed], [Lead, Corresponding]
Scientific journal
DOI：https://doi.org/10.1103/PhysRevB.102.121106
DOI ID：10.1103/PhysRevB.102.121106, ORCID：80444045 - Spin structure at zero magnetic field and field-induced spin reorientation transitions in a layered organic canted antiferromagnet bordering a superconducting phase
Kohsuke Oinuma; Naoki Okano; Hitoshi Tsunakawa; Shinji Michimura; Takuya Kobayashi; Hiromi Taniguchi; Kazuhiko Satoh; Julia Angel; Isao Watanabe; Yasuyuki Ishii; Hiroyuki Okamoto; Tetsuaki Itou
Physical Review B, Jul. 2020, [Reviewed]
Scientific journal
DOI：https://doi.org/10.1103/PhysRevB.102.035102
DOI ID：10.1103/PhysRevB.102.035102, ORCID：76589651 - Spin-density wave in the vicinity of superconducting state in λ−(BETS)2GaBrxCl4−x probed by C13 NMR spectroscopy
T. Kobayashi; T. Ishikawa; A. Ohnuma; M. Sawada; N. Matsunaga; H. Uehara; A. Kawamoto
Physical Review Research, Apr. 2020, [Reviewed], [Lead, Corresponding]
English, Scientific journal
DOI：https://doi.org/10.1103/PhysRevResearch.2.023075
DOI ID：10.1103/PhysRevResearch.2.023075, ORCID：72768911 - Inhomogeneous electronic state of organic conductor κ−(BEDT-TTF)2Cu[N(CN)2]I studied by C13 NMR spectroscopy
T. Kobayashi; A. Suzuta; K. Tsuji; Y. Ihara; A. Kawamoto
Physical Review B, Volume：100, Number：19, First page：195115, Nov. 2019, [Reviewed], [Lead, Corresponding]
American Physical Society ({APS}), English, Scientific journal
DOI：https://doi.org/10.1103/PhysRevB.100.195115
DOI ID：10.1103/PhysRevB.100.195115, ORCID：64693158 - Gap Symmetry of the Organic Superconductor λ-(BETS)2GaCl4 Determined by Magnetic-Field-Angle-Resolved Heat Capacity
Imajo Shusaku; Yamashita Satoshi; Akutsu Hiroki; Kumagai Hiroya; Kobayashi Takuya; Kawamoto Atsushi; Nakazawa Yasuhiro
Journal of the Physical Society of Japan, Volume：88, Number：2, First page：023702, Feb. 2019, [Reviewed]
English, Scientific journal
DOI：https://doi.org/10.7566/JPSJ.88.023702
DOI ID：10.7566/JPSJ.88.023702, ISSN：0031-9015, ORCID：70591543, Web of Science ID：WOS:000455726300005 - Antiferromagnetic ordering in organic conductor λ-(BEDT-TTF)2GaCl4 probed by 13CNMR
Yohei Saito; Shuhei Fukuoka; Takuya Kobayashi; Atsushi Kawamoto; Hatsumi Mori
Journal of the Physical Society of Japan, Volume：87, Number：1, First page：013707, 2018, [Reviewed]
The ground state of λ-(BEDT-TTF)2GaCl4, which has the same structure as the organic superconductor λ-(BETS)2-GaCl4, was investigated by magnetic susceptibility and 13C NMR measurements. The temperature dependence of the magnetic susceptibility revealed an antiferromagnetic (AF) correlation with J/kB ∼ 98 K. NMR spectrum splitting and the divergence of 1=T1 were observed at approximately 13 K, which is associated with the AF transition. We found that the AF structure is commensurate according to discrete NMR peak splitting, suggesting that the ground state of λ- (BEDT-TTF)2GaCl4 is an AF dimer-Mott insulating state. Our results suggest that the superconducting phase of λ-type salts would be located near the AF insulating phase.
Physical Society of Japan, English, Scientific journal
DOI：https://doi.org/10.7566/JPSJ.87.013707
DOI ID：10.7566/JPSJ.87.013707, ISSN：1347-4073, ORCID：51449707, SCOPUS ID：85040101205 - Evidence of antiferromagnetic fluctuation in the unconventional superconductor lambda-(BETS)(2)GaCl4 by C-13 NMR
T. Kobayashi; A. Kawamoto
PHYSICAL REVIEW B, Volume：96, Number：12, First page：125115, Sep. 2017, [Reviewed], [Lead, Corresponding]
We performed C-13 NMR measurements on the unconventional organic superconductor lambda-(BETS)(2)GaCl4 to clarify its electronic properties in the paramagnetic state. We found that the spin-lattice relaxation rate divided by temperature 1/T1T shows Curie-like enhancement above 55 K that arises from an antiferromagnetic fluctuation. In addition, we found additional enhancement of 1/T1T below 10 K, where the Knight shift decreases and the linewidth of NMR spectra is broadened. The result could be understood by the magnetic fluctuation induced by the nesting of the Fermi surface. We discovered that lambda-(BETS)(2)GaCl4 salt inherently exhibits the two different types of magnetic fluctuations.
AMER PHYSICAL SOC, English, Scientific journal
DOI：https://doi.org/10.1103/PhysRevB.96.125115
DOI ID：10.1103/PhysRevB.96.125115, ISSN：2469-9950, eISSN：2469-9969, ORCID：51449709, Web of Science ID：WOS:000410002000005 - Thermodynamic Evidence of d-Wave Superconductivity of the Organic Superconductor lambda-( BETS)(2)GaCl4
Shusaku Imajo; Naoki Kanda; Satoshi Yamashita; Hiroki Akutsu; Yasuhiro Nakazawa; Hiroya Kumagai; Takuya Kobayashi; Atsushi Kawamoto
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, Volume：85, Number：4, First page：043705, Apr. 2016, [Reviewed]
Low-temperature heat capacity of the organic superconductor lambda-(BETS)(2)GaCl4 in a temperature range between 0.6 and 10K was measured for a single crystal sample by relaxation calorimetry technique. The contribution of electronic heat capacity in the superconducting state shows T-2 dependence at lower temperature that indicates the existence of quasi-particle excitations from the line-nodal gap structure of d-wave pairing. The recovery of the electronic heat capacity coefficient, gamma by magnetic field shows H-1/2 dependence that is consistent with the picture of line-nodal superconductor. In spite of the different packing from typical organic superconductors kappa-(BEDT-TTF)(2)X, the lambda-type BETS salt also shows a feature of d-wave symmetry pairing.
PHYSICAL SOC JAPAN, English, Scientific journal
DOI：https://doi.org/10.7566/JPSJ.85.043705
DOI ID：10.7566/JPSJ.85.043705, ISSN：0031-9015, ORCID：51449708, Web of Science ID：WOS:000373341100002 - Modification of local electronic state by BEDT-STF doping to kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]Br salt studied by C-13 NMR spectroscopy
T. Kobayashi; Y. Ihara; A. Kawamoto
PHYSICAL REVIEW B, Volume：93, Number：9, First page：094515, Mar. 2016, [Reviewed], [Lead]
We present the results of site-selective C-13 NMR spectroscopy on an organic superconductor kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]Br(kappa-Br) doped with BEDT-STF molecules. We reveal microscopically the modulation of the local electronic state caused by the BEDT-STF doping from the C-13 NMR measurement on two types of samples, which are C-13 enriched kappa-Br doped with naturally abundant BEDT-STF molecules, and natural kappa-Br doped with C-13 enriched BEDT-STF molecules. The results of the nuclear spin-lattice relaxation rate 1/T-1 measured both in the normal and superconducting state suggest that the potential disorder at the BEDT-STF sites scatters antiferromagnetic interaction and superconducting Cooper pairs.
AMER PHYSICAL SOC, English, Scientific journal
DOI：https://doi.org/10.1103/PhysRevB.93.094515
DOI ID：10.1103/PhysRevB.93.094515, ISSN：2469-9950, eISSN：2469-9969, ORCID：51449711, Web of Science ID：WOS:000372400100007 - Microscopic observation of superconducting fluctuations in kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]Br by C-13 NMR spectroscopy
T. Kobayashi; Y. Ihara; Y. Saito; A. Kawamoto
PHYSICAL REVIEW B, Volume：89, Number：16, First page：165141, Apr. 2014, [Reviewed], [Lead]
We performed C-13-NMR experiment and measured spin-lattice relaxation rate divided by temperature 1/T1T near the superconducting (SC) transition temperature T-c in kappa-(BEDT-TTF)(2)Cu[N(CN)(2)] Br (kappa-Br salt), and kappa-(BEDT-TTF)(2)Cu(NCS)(2) (kappa-NCS salt). We observed the reduction of 1/T1T starting at the temperature higher than T-c in kappa-Br salt. Microscopic observation of the quasiparticle density of states in the fluctuating SC state revealed the effects of short-range Cooper pairs induced in the normal state to the quasiparticle density of states. We also performed systematic measurements in the fields both parallel and perpendicular to the conduction plane in kappa-Br and kappa-NCS salts, and confirmed that the reduction of 1/T1T above T-c is observed only in kappa-Br salt regardless of the external field orientation.
AMER PHYSICAL SOC, English, Scientific journal
DOI：https://doi.org/10.1103/PhysRevB.89.165141
DOI ID：10.1103/PhysRevB.89.165141, ISSN：1098-0121, eISSN：1550-235X, ORCID：51449710, Web of Science ID：WOS:000335797600006
- CCDC 2419781: Experimental Crystal Structure Determination
Takuya Kobayashi; Keiichi Sato; Hidetoshi Yamada; Hiromi Taniguchi
Jan. 2025, [Lead]
Others
DOI：https://doi.org/10.5517/ccdc.csd.cc2m6zg9
DOI ID：10.5517/ccdc.csd.cc2m6zg9 - Thermal transport in an organic Dirac electron system α-(BETS)2I3
古川哲也; 西川哲也; 加藤拓洋; 小林拓矢; 谷口弘三; 佐々木孝彦
東北大学金属材料研究所強磁場超伝導材料研究センター年次報告, Volume：2023, 2024
J-Global ID：202402250238664543 - Investigation of π-d interaction on λ-(BEST)2FeCl4
齋藤陸丸; 飯田瑶平; 小林拓矢; 谷口弘三; 松永悟明; 福岡脩平; 河本充司
日本物理学会講演概要集(CD-ROM), Volume：78, Number：1, 2023
ISSN：2189-079X, J-Global ID：202302255280680023 - Pseudogap near a BCS-BEC crossover regime of strongly correlated organic superconductors
今城周作; 小林拓矢; 松村祐希; 中澤康浩; 谷口弘三; 金道浩一
日本物理学会講演概要集(CD-ROM), Volume：78, Number：1, 2023
ISSN：2189-079X, J-Global ID：202302286980491889 - Electrical resistivity measurements of λ-type organic Mott insulators under high pressure
小林拓矢; 小林拓矢; 安村乃絵瑠; 伊藤有咲; 辺土正人; 郷地順; 上床美也; 斉藤洋平; 河本充司; 森初果; 谷口弘三
日本物理学会講演概要集(CD-ROM), Volume：78, Number：1, 2023
ISSN：2189-079X, J-Global ID：202302214670469979 - Bandwidth control of λ-type organic conductor by alloying donor molecules
大岩芽衣; 小林拓矢; 小林拓矢; 谷口弘三
日本物理学会講演概要集(CD-ROM), Volume：78, Number：1, 2023
ISSN：2189-079X, J-Global ID：202302271731821945 - Analysis of Multiple Raman Peaks Observation in κ-(BEST)2Cu2(CN)3
山本貴; 売市幹夫; 小林拓矢; 谷口弘三; 齋藤陸丸; 河本充司
日本物理学会講演概要集(CD-ROM), Volume：78, Number：2, 2023
ISSN：2189-079X, J-Global ID：202302229156617383 - Muon spin rotation experiment on antiferromagnetic state of β’-(BEDT-TTF)2ICl2 under high pressure
高久雅輝; 高久雅輝; 髭本亘; 髭本亘; 佐藤一彦; 齋藤奨太; 伊藤孝; 藤原理賀; 只野涼; 小林拓矢; 谷口弘三
日本物理学会講演概要集(CD-ROM), Volume：78, Number：2, 2023
ISSN：2189-079X, J-Global ID：202302231956059272 - Zero-field μSR of the organic Dirac electron system α-(BETS)2I3
加藤拓洋; 小林拓矢; 小林拓矢; 谷口弘三; 中村惇平; 髭本亘; 髭本亘
日本物理学会講演概要集(CD-ROM), Volume：78, Number：2, 2023
ISSN：2189-079X, J-Global ID：202302214698311256 - Time evolution of magnetization of θ-(BEDT-TTF)2RbZn(SCN)4 in the charge glass phase
樋口圭太; 小林拓矢; 小林拓矢; 谷口弘三
日本物理学会講演概要集(CD-ROM), Volume：78, Number：2, 2023
ISSN：2189-079X, J-Global ID：202302220947582350 - Development of low-symmetry organic conductors with one-sided bent asymmetric molecules
山田英寿; 佐藤慧一; 小林拓矢; 小林拓矢; 谷口弘三
日本物理学会講演概要集(CD-ROM), Volume：78, Number：2, 2023
ISSN：2189-079X, J-Global ID：202302259033405516 - μSR study on single-component molecular crystal Au(dexbdt)2 with canted antiferromagnetism
只野涼; SARI Dita Puspita; SARI Dita Puspita; 小林拓矢; 小林拓矢; 谷口弘三; 横森創; 森初果; 高久雅輝; 高久雅輝; 中村惇平; 髭本亘; 髭本亘
日本物理学会講演概要集(CD-ROM), Volume：78, Number：2, 2023
ISSN：2189-079X, J-Global ID：202302277672175993 - Quantitative analysis of κ-type organic antiferromagnets with material-based Kugel-Khomskii model
岩崎龍太; 小林拓矢; 谷口弘三; 星野晋太郎
日本物理学会講演概要集(CD-ROM), Volume：78, Number：2, 2023
ISSN：2189-079X, J-Global ID：202302212167562250 - Development of organic conductors based on asymmetrical TTF derivatives with propylene group
佐藤慧一; 只野涼; 山田英寿; 小林拓矢; 小林拓矢; 谷口弘三
日本物理学会講演概要集(CD-ROM), Volume：77, Number：2, 2022
ISSN：2189-079X, J-Global ID：202302228722809872 - Magnetic structure of organic antiferromagnet λ-(BEDSe-TTF)2GaCl4 studied by magnetic torque measurement
小林拓矢; 簗田春希; 安村乃絵瑠; 谷口弘三; 今城周作; 松尾晶; 金道浩一
日本物理学会講演概要集(CD-ROM), Volume：77, Number：1, 2022
ISSN：2189-079X, J-Global ID：202202228249436271 - Relaxor-like behavior in the λ-type organic conductors
福岡脩平; 齋藤陸丸; 井原慶彦; 河本充司; 小林拓矢; 小林拓矢; 谷口弘三
日本物理学会講演概要集(CD-ROM), Volume：77, Number：2, 2022
ISSN：2189-079X, J-Global ID：202302236904541655 - Basic Physical Properties of Organic Conductor κ-(BETS)2CF3SO3
高橋賢信; 小林拓矢; 小林拓矢; 谷口弘三
日本物理学会講演概要集(CD-ROM), Volume：77, Number：2, 2022
ISSN：2189-079X, J-Global ID：202302247339618104 - Studies on U/W dependence of superconducting fluctuations in κ-ET organic superconductors by magnetization measurements
山田瑛己; 三輪大哲; 小林拓矢; 小林拓矢; 谷口弘三
日本物理学会講演概要集(CD-ROM), Volume：77, Number：2, 2022
ISSN：2189-079X, J-Global ID：202302280278078572 - Phase Diagram of an Organic Superconductor λ-(BETS)2 GaCl4 in the Vicinity of the Superconducting Phase Revealed by NMR Spectroscopy
小林拓矢; 河本充司
日本物理学会誌, Volume：76, Number：7, 2021
ISSN：0029-0181, J-Global ID：202102290860919964 - 有機超伝導体λ-(BETS)2GaCl4の69Ga-NMRによる研究
辻晃平; 小林拓矢; 河本充司
Volume：73, Number：1, 2018
ISSN：2189-079X, J-Global ID：201802259052620365 - 13C-NMR法によるλ-(BETS)2GaCl4の反強磁性揺らぎの研究
小林拓矢; 河本充司
Volume：72, Number：1, 2017
ISSN：2189-079X, J-Global ID：201702224133194845 - 有機超伝導体λ-(BETS)2GaCl4のFFLO超伝導に関する熱的研究
今城周作; 山下智史; 圷広樹; 熊谷浩也; 小林拓矢; 河本充司; 中澤康浩
Volume：72, Number：1, 2017
ISSN：2189-079X, J-Global ID：201702282742068016 - 13C-NMR法によるλ-(BETS)2GaCl4の超伝導ギャップ対称性の研究
小林拓矢; 河本充司
Volume：72, Number：2, 2017
ISSN：2189-079X, J-Global ID：201702227929594387 - 一軸圧力下NMR実験によるα-(BEDT-TTF)2MHg(SCN)4の電荷密度波相と超伝導相の研究
大沼晃浩; 熊谷浩也; 藁谷拓実; 小林拓矢; 齋藤洋平; 福岡脩平; 井原慶彦; 河本充司
Volume：71, Number：2, 2016
ISSN：2189-079X, J-Global ID：201602254870627587 - λ-(BETS)2GaCl4の超伝導ギャップ構造
今城周作; 菅田尚輝; 山下智史; 圷広樹; 熊谷浩也; 小林拓矢; 河本充司; 中澤康浩
Volume：71, Number：2, 2016
ISSN：2189-079X, J-Global ID：201602297298433191 - 13C-NMRを用いたκ-(BEDT-TTF)2Cu[N(CN)2]BrのBEDT-STFドープによる不純物効果の研究
小林拓矢; 井原慶彦; 河本充司
Volume：69, Number：1, 2014
ISSN：1342-8349, J-Global ID：201402290428776712 - 有機超伝導体κ-(BEDT-TTF)2Cu(NCS)2の面内角度分解NMRによる超伝導対称性の研究
斉藤洋平; 小林拓矢; 井原慶彦; 河本充司
Volume：68, Number：2, 2013
ISSN：1342-8349, J-Global ID：201302220915699655
- Synthesis and characterization of organic charge-transfer complexes composed of multiple donor molecules
柳原宏紀; 小林拓矢; 小林拓矢; 谷口弘三
日本物理学会講演概要集(CD-ROM), 2024
2024 - 2024 - Impurity effects by donor molecular substitution on charge-glass state and charge crystallization in θ-(BEDT-TTF)2RbZn(SCN)4
椎橋裕樹; 八谷司; 小林拓矢; 小林拓矢; 吉見一慶; 谷口弘三
日本物理学会講演概要集(CD-ROM), 2024
2024 - 2024 - Pressure-induced Lifshitz transition in organic Mott insulator β′-(BEDT-TTF)2ICl2
小林拓矢; 小林拓矢; 吉見一慶; MA H.; MA H.; 関根俊介; 谷口弘三; 松永悟明; 河本充司; 上床美也
日本物理学会講演概要集(CD-ROM), 2024
2024 - 2024 - Magneto thermoelectric effect of ambient-pressure organic Dirac electron system α-(BETS)2I3
西川哲也; 古川哲也; 井口敏; 加藤拓洋; 小林拓矢; 谷口弘三; 佐々木孝彦
日本物理学会講演概要集(CD-ROM), 2024
2024 - 2024 - 13C NMR measurements on λ-(BEDSe-TTF)2FeCl4 under pressure
齋藤陸丸; 出井智之; 小林拓矢; 小林拓矢; 谷口弘三; 松永悟明; 福岡脩平; 河本充司
日本物理学会講演概要集(CD-ROM), 2024
2024 - 2024 - Determination of charge ordering pattern of organic salt α′-(ET)2IBr2 using XRD
YOON D.; 谷口弘三; 小林拓矢; 小林拓矢; 福岡脩平; 河本充司
日本物理学会講演概要集(CD-ROM), 2024
2024 - 2024 - Verification of 6 K anomaly in κ-[(ET)0.5(BEST)0.5]2Cu2(CN)3
若杉京樹; 谷口弘三; 小林拓矢; 小林拓矢; 福岡脩平; 斎藤陸丸; 小坂辰明; 河本充司
日本物理学会講演概要集(CD-ROM), 2024
2024 - 2024 - Pressure-induced structural phase transition in (DMET-TTF)2AuBr2
加藤大賀; MA Hanming; 吉見一慶; 三澤貴宏; 熊谷誌元; 飯田瑶平; 佐々木義明; 澤田賢志; 郷地順; 小林拓矢; 谷口弘三; 上床美也; 佐藤寛泰; 松永悟明; 河本充司; 野村一成
日本物理学会講演概要集(CD-ROM), 2024
2024 - 2024 - Raman Spectra of κ-(d8-BEST)2Cu2(CN)3
山本貴; 山本貴; 売市幹夫; 小林拓矢; 谷口弘三; 若杉京樹; 齋藤陸丸; 河本充司
日本物理学会講演概要集(CD-ROM), 2024
2024 - 2024 - Observation of charge-glass state and charge crystallization by ESR in θ-(BEDT-TTF)2RbZn(SCN)4: II
八谷司; 小林拓矢; 小林拓矢; 谷口弘三
日本物理学会講演概要集(CD-ROM), 2024
2024 - 2024 - Interlayer transverse magnetoresistance in metallic phase in κ-type organic superconductors
三輪大哲; 小林拓矢; 小林拓矢; 谷口弘三; 河本充司; 川椙義高; 田嶋尚也
日本物理学会講演概要集(CD-ROM), 2024
2024 - 2024 - Pressure dependence of magnetic phase transition in λ-(BEDSe-TTF)2GaCl4 observed by muon spin rotation method
齋藤奨太; 齋藤奨太; 髭本亘; 髭本亘; 高久雅輝; 高久雅輝; 佐藤泰海; 伊藤孝; 藤原理賀; 北本力輝; 遊佐卓人; 小林拓矢; 谷口弘三
日本物理学会講演概要集(CD-ROM), 2024
2024 - 2024 - Elucidation of pressure-induced phase transition in organic magnet by using muon spin rotation method under high pressure at J-PARC
齋藤奨太; 高久雅輝; 高久雅輝; 伊藤孝; 藤原理賀; 北本力輝; 遊佐卓人; 小林拓矢; 谷口弘三; 髭本亘; 髭本亘
量子ビームサイエンスフェスタ(Web), 2024
2024 - 2024 - Analysis of interlayer electron hopping effects in the magnetic structure of κ-type organic antiferromagnets
岩崎龍太; 中惇; 小林拓矢; 谷口弘三; 星野晋太郎
日本物理学会講演概要集(CD-ROM), 2024
2024 - 2024 - Thermoelectricity and thermal conductivity of ambient-pressure organic Dirac electron system α-(BETS)2I3
古川哲也; 西川哲也; 井口敏; 加藤拓洋; 小林拓矢; 谷口弘三; 佐々木孝彦
日本物理学会講演概要集(CD-ROM), 2024
2024 - 2024 - Observation of charge-glass state and charge crystallization by ESR in θ-(BEDT-TTF)2RbZn(SCN)4
八谷司; 樋口圭太; 小林拓矢; 小林拓矢; 谷口弘三
日本物理学会講演概要集(CD-ROM), 2024
2024 - 2024 - ESR measurements on κ-(BEST)2Cu2(CN)3
小林拓矢; 小林拓矢; 遊佐卓人; 若杉京樹; 齋藤陸丸; 河本充司; 谷口弘三
日本物理学会講演概要集(CD-ROM), 2024
2024 - 2024 - ESR study of charge transfer salt β′-(BEST)2CuCl2
関根俊介; 小林拓矢; 小林拓矢; 斎藤陸丸; 若杉京樹; 河本充司; 谷口弘三
日本物理学会講演概要集(CD-ROM), 2024
2024 - 2024 - Analysis of magnetic susceptibility along the easy axis of magnetization in canted antiferromagnet κ-BEDT-TTF salts
北本力輝; 只野涼; 小林拓矢; 小林拓矢; 谷口弘三
日本物理学会講演概要集(CD-ROM), 2024
2024 - 2024 - Time evolution of magnetization of θ-(BEDT-TTF)2 RbZn(SCN)4 in the charge glass phase: II
樋口圭太; 小林拓矢; 小林拓矢; 谷口弘三; 吉見一慶
日本物理学会講演概要集(CD-ROM), 2024
2024 - 2024 - Pressure-induced anomalous electronic phases of λ-(BEDSe-TTF)2GaCl4 measured by 69,71Ga NMR
安村乃絵瑠; 小林拓矢; 谷口弘三; 福岡脩平; 河本充司
日本物理学会講演概要集(CD-ROM), 2022
2022 - 2022 - Examination on the cooling rate dependence of the antiferromagnetic phase in κ-(d8-BEDT-TTF)2Cu[N(CN)2]Br by zero-field μSR
只野涼; 石川瑠偉; 小林拓矢; 谷口弘三; 石井康之; 渡邊功雄
日本物理学会講演概要集(CD-ROM), 2022
2022 - 2022 - Magnetic Structure of organic antiferromagnet κ-type ET salt studied by magnetic torque measurement
簗田春希; 小林拓矢; 今城周作; 綱川仁志; 安村乃絵瑠; 谷口弘三
日本物理学会講演概要集(CD-ROM), 2022
2022 - 2022 - Magnetic structure of organic antiferromagnet λ-(BEDSe-TTF)2GaCl4 studied by magnetic torque measurement
小林拓矢; 簗田春希; 安村乃絵瑠; 谷口弘三; 今城周作; 松尾晶; 金道浩一
日本物理学会講演概要集(CD-ROM), 2022
2022 - 2022 - Growth of large single crystals of TTF-TCNQ by the cooling method and their evaluation by monochromatic X-ray topography
佐藤慧一; 小林拓矢; 谷口弘三; 岡本博之; 水野薫
日本物理学会講演概要集(CD-ROM), 2022
2022 - 2022 - 127I-NQR study of organic superconductor β-(BEDT-TTF)2I3
伊藤篤史; 加藤優樹; 小林拓矢; 小林拓矢; 谷口弘三; 圓谷貴夫; 藤山茂樹
日本物理学会講演概要集(CD-ROM), 2022
2022 - 2022 - 127I-NQR study on the Charge Ordering in Molecular Conductor α-(BEDT-TTF)2I3
加藤優樹; 小林拓矢; 小林拓矢; 谷口弘三; 藤山茂樹; 開康一
日本物理学会講演概要集(CD-ROM), 2021
2021 - 2021 - Analysis of the superconducting phase of κ-(d81-xh8x-ET)2Cu[N(CN)2]Br by ac magnetic susceptibility measurement
高橋啓太; 小澤宏彬; 小林拓矢; 谷口弘三
日本物理学会講演概要集(CD-ROM), 2021
2021 - 2021 - Synthesis and Physical Properties of New Charge-Transfer Complexes (BEDT-STF)2ICl2
HONG J.; 小林拓矢; 道村真司; 道村真司; 谷口弘三
日本物理学会講演概要集(CD-ROM), 2021
2021 - 2021 - Microscopic Investigation of Zero-field Spin Structure in κ-type ET Salts by 63Cu-NQR
山崎大誠; 小林拓矢; 加藤優樹; 綱川仁志; 佐藤一彦; 谷口弘三; 河本充司
日本物理学会講演概要集(CD-ROM), 2021
2021 - 2021 - Carrier doping by chemical substitution on organic Mott insulator λ-(BEST)2GaCl4
小梁川響子; 小林拓矢; 櫻井健人; 谷口弘三
日本物理学会講演概要集(CD-ROM), 2021
2021 - 2021 - Observation of antiferromagnetic ordering in organic charge-transfer salt λ-(BEST)2GaCl4 using microscopic measurements
小林拓矢; 伊藤有咲; SARI Dita Puspita; SARI Dita Puspita; 渡邊功雄; 斉藤洋平; 河本充司; 佐藤一彦; 谷口弘三
日本物理学会講演概要集(CD-ROM), 2021
2021 - 2021 - Study on antiferromagnetic phase of κ-ET salt by alloy samples
生沼浩介; 綱川仁志; 鈴木航平; 道村真司; 道村真司; 小林拓矢; 谷口弘三; 佐藤一彦; 石井康之; 岡本博之; 伊藤哲明
日本物理学会講演概要集(CD-ROM), 2021
2021 - 2021 - 13C-NMR study of λ-(BETS)2GaBrxCl4-x (x=0.9)
岡太耀; 河本充司; 澤田賢志; 石川貴子; 小林拓矢
日本物理学会講演概要集(CD-ROM), 2021
2021 - 2021 - 69,71Ga-NMR of λ-(BEST)2GaCl4
河本充司; 福岡脩平; 小川巧真; 伊藤悠馬; 伊藤有咲; 小林拓矢; 谷口弘三
日本物理学会講演概要集(CD-ROM), 2021
2021 - 2021 - Low dimensional magnetism of ytterbium insulator YbAgS2
飯塚亮介; 道村真司; 道村真司; 青木優樹; 佐藤一彦; 小林拓矢; 谷口弘三; 髭本亘; 石崎嵩人; 山本隆文; 大山研司; 赤木暢; 大久保晋; 太田仁; 小坂昌史
日本物理学会講演概要集(CD-ROM), 2021
2021 - 2021 - Physical Properties and Electrical Resistance Under Pressures of A New Charge-Transfer Complex κ-(BEST)2Cu2(CN)3
櫻井健人; 小林拓矢; 谷口弘三; 佐藤一彦; 道村真司; 道村真司; 小坂昌史
日本物理学会講演概要集(CD-ROM), 2021
2021 - 2021 - Discovery of 10 K Class Pressure-Induced Superconductivity in a New Organic Charge-Transfer Complex (BEST)2CuCl2
菅原佳哉; 天川智之; 小林拓矢; 谷口弘三; 佐藤一彦; 郷地順; 上床美也
日本物理学会講演概要集(CD-ROM), 2021
2021 - 2021 - Extension of antiferromagnetic phase in pressure-temperature phase diagram of λ-type organic conductor using BEDSe-TTF molecular substitution
伊藤有咲; 小林拓矢; 谷口弘三; 佐藤一彦; 綱川仁志; 渡邊功雄; SARI Dita Puspita
日本物理学会講演概要集(CD-ROM), 2020
2020 - 2020 - Synthesis and physical properties of quasi-two-dimensional triangular-lattice organic conductor κ-(BEST)2Cu2(CN)3
櫻井健人; 綱川仁志; 小林拓矢; 谷口弘三; 佐藤一彦
日本物理学会講演概要集(CD-ROM), 2020
2020 - 2020 - Muon spin rotation and relaxation studies on layered organic antiferromagnetic insulators, bis(ethylenediseleno)tetrathiafulvalene (BEDSe-TTF) based salt, β’-(BEDSe-TTF)2ICl2 and β’-(BEDSe-TTF)2IBr2
渋谷淳; 綱川仁志; 大島美由紀; 小松宏彰; 小林拓矢; 谷口弘三; 佐藤一彦; 髭本亘; 髭本亘; 幸田章宏; 幸田章宏
日本物理学会講演概要集(CD-ROM), 2020
2020 - 2020 - 13C-NMR on λ-(BETS)2GaBr0.75Cl3.25
石川貴子; 澤田賢志; 大沼晃浩; 河本充司; 小林拓矢
日本物理学会講演概要集(CD-ROM), 2020
2020 - 2020 - 63Cu-NQR Study of organic superconductor κ-(BEDT-TTF)2Cu[N(CN)2]Br under zero magnetic field
小澤宏彬; 小林拓矢; 綱川仁志; 生沼浩介; 佐藤一彦; 谷口弘三; 河本充司
日本物理学会講演概要集(CD-ROM), 2020
2020 - 2020 - 63Cu-NQRによるκ-(ET)2Cu[N(CN)2]Clの磁気構造の研究
綱川仁志; 生沼浩介; 小林拓矢; 谷口弘三; 佐藤一彦; 河本充司
2019
2019 - 2019 - 63Cu-NQRによるκ-(BEDT-TTF)2Cu2(CN)3の研究
小林拓矢; 小林拓矢; 古川裕次; DING Qing-Ping; 河本充司; 佐藤一彦; 谷口弘三
2019
2019 - 2019 - κ型ET塩の反強磁性相における2つのゼロ磁場磁気構造
生沼浩介; 綱川仁志; 道村真司; 道村真司; 小林拓矢; 谷口弘三; 佐藤一彦; 石井康之; 岡本博之; 伊藤哲明
2019
2019 - 2019 - κ型ET塩の反強磁性相が示す磁場誘起スピン再配向転移の相図
鈴木航平; 生沼浩介; 綱川仁志; 道村真司; 道村真司; 小林拓矢; 谷口弘三; 佐藤一彦; 石井康之; 岡本博之
2019
2019 - 2019 - 有機超伝導体λ-(BETS)2GaCl4の69/71Ga-NMR法を用いた電荷/スピン異常の選択的検出
辻晃平; 小林拓矢; 河本充司
2019
2019 - 2019 - Zero-field magnetic structure of κ-(d8-ET)2Cu[N(CN)2]Br
Oinuma Kohsuke; Tsunakawa Hitoshi; Michimura Shinji; Kobayashi Takuya; Taniguchi Hiromi; Satoh Kazuhiko; Ishii Yasuyuki; Okamoto Hiroyuki
Meeting Abstracts of the Physical Society of Japan, 2018, The Physical Society of Japan
2018 - 2018, Japanese - Zero-field μSR on an antiferromagnetic phase of κ-ET2X
Taniguchi Hiromi; Watanabe Isao; Ishikawa Rui; Kobayashi Takuya; Michimura Shinji; Satoh Kazuhiko; Ishii Yasuyuki; Astuti Fahmi; Asih Retno; Angel Julia
Meeting Abstracts of the Physical Society of Japan, 2018, The Physical Society of Japan
2018 - 2018, Japanese - Superconductor – antiferromagnetic insulator transition in κ-(d8-ET)2Cu[N(CN)2]Br
Ozawa Hiroaki; Okano Naoki; Kobayashi Takuya; Michimura Shinji; Taniguchi Hiromi; Satoh Kazuhiko
Meeting Abstracts of the Physical Society of Japan, 2018, The Physical Society of Japan
2018 - 2018, Japanese - 69Ga-NMR Study on Organic Superconductor λ-(BETS)2GaCl4
Tsuji Kouhei; Kobayashi Takuya; Kawamoto Atsushi
Meeting Abstracts of the Physical Society of Japan, 2018, The Physical Society of Japan
2018 - 2018, Japanese - κ-(d8-ET)2Cu[N(CN)2]Brのゼロ磁場磁気構造
生沼浩介; 綱川仁志; 道村真司; 道村真司; 小林拓矢; 谷口弘三; 佐藤一彦; 石井康之; 岡本博之
2018
2018 - 2018 - κ-(d8-BEDT-TTF)2Cu[N(CN)2]Brの超伝導-反強磁性転移
小澤宏彬; 岡野修樹; 小林拓矢; 道村真司; 谷口弘三; 佐藤一彦
2018
2018 - 2018 - κ-(ET)2Cu[N(CN)2]Iにおける圧力下13C-NMR測定
鈴田耀大; 小林拓矢; 井原慶彦; 河本充司
2017
2017 - 2017 - 13C NMR study of !LaTeX$\kappa$-(ET)2Cu[N(CN)2]I under pressure
Suzuta Akio; Kobayashi Takuya; Ihara Yoshihiko; Kawamoto Atsushi
Meeting Abstracts of the Physical Society of Japan, 2017
Japanese有機伝導体!LaTeX$\kappa$-(ET)_2_Cu[N(CN)_2_]X (X=Br,Cl)は盛んに研究されており、同一の温度-圧力相図で理解される。X=Cl,Br塩と同形であるX=I塩もイオン半径の類推から金属相に位置すると考えられるが、電気抵抗測定からは常圧下で絶縁体、圧力下で超伝導体であることがわかっている。X=I塩の物性が共通の温度-圧力相図で理解できないことを明らかにするために常圧及び圧力下における^13^C NMR測定を行った。
- Thermodynamic study of a FFLO state in λ-(BETS)2GaCl4
Imajo Shusaku; Yamashita Satoshi; Akutsu Hiroki; Kumagai Hiroya; Kobayashi Takuya; Kawamoto Atsushi; Nakazawa Yasuhiro
Meeting Abstracts of the Physical Society of Japan, 2017
Japanese表題物質は特殊な超伝導状態であるFFLO状態を示す候補物質のひとつである。FFLO状態は高い磁場下でゼーマン分裂によるエネルギーの損をクーパー対が重心運動量を持つことで抑えることで発現する超伝導である。本研究では表題物質の高磁場下熱容量測定からFFLO状態の熱力学的な性質を議論する予定である。
- 13C-NMR study of antiferromagnetic fluctuation in !LaTeX$\lambda$-(BETS)2GaCl4
Kobayashi Takuya; Kawamoto Atsushi
Meeting Abstracts of the Physical Society of Japan, 2017
Japanese!LaTeX$\lambda$-(BETS)_2_GaCl_4_はFFLO超伝導相やd波の超伝導対称性が報告されている非従来型の超伝導体である。超伝導メカニズムを解明するためには、まず超伝導転移温度以上における常伝導相の電子状態を調べることが必要である。しかしこれまでのところ、それを明らかにする適切なプローブがなかった。本研究では、BETS分子の中心の炭素を^13^Cに置換した試料を作製し、^13^C NMR測定を行った。その結果、およそ90K以上に反強磁性ゆらぎがあることを発見した。
- 13C‒NMR study of superconducting gap symmetry in λ‒(BETS)2GaCl4
Kobayashi Takuya; Ihara Yoshihiko; Kawamoto Atsushi
Meeting Abstracts of the Physical Society of Japan, 2017
Japanese - NMR study under the uniaxial strain for charge density wave and superconductivity in α-(BEDT-TTF)2RbHg(SCN)4
Ohnuma A; Kumagai H; Waragai T; Kobayashi T; Saito Y; Fukuoka S; Ihara Y; Kawamoto A
Meeting Abstracts of the Physical Society of Japan, 2016
Japanese電荷密度波相近傍に超伝導が見つかっている物質として\alpha-(BEDT-TF)_2_MHg(SCN)_4_ (M=K，Rb，NH_4_)がある。Rb塩はT_CDW_=12 Kで電荷密度波転移し、NH_4_塩はT_C_=1.5 Kで超伝導転移する。二つの塩の関係は一軸圧法で調べられており、c軸圧により超伝導が誘起されることが示唆されている。超伝導の誘起に伴う電子状態の変化を観測するために、Rb塩を対象にc軸圧下NMR測定を行った。
- Superconducting energy gap structure of the organic superconductor λ-(BETS)2GaCl4
Imajo Shusaku; Kanda Naoki; Yamashita Satoshi; Akutsu Hiroki; Kumagai Hiroya; Kobayashi Takuya; Kawamoto Atsushi; Nakazawa Yasuhiro
Meeting Abstracts of the Physical Society of Japan, 2016
Japanese有機超伝導体の一つλ-(BETS)_2_GaCl_4_はDimer Mott系の塩であると考えられ、そのため反強磁性スピンゆらぎを起源としたd波超伝導が発現している可能性が考えられている。そこで熱容量測定から超伝導状態の準粒子の低エネルギー励起構造からギャップ構造の研究を行い、d波超伝導状態であることを決定した。
- 13C‐NMRを用いたκ‐(BEDT‐TTF)2Cu[N(CN)2]BrのBEDT‐STFドープによる不純物効果の研究
KOBAYASHI TAKUYA; IHARA YOSHIHIKO; KAWAMOTO ATSUSHI
日本物理学会講演概要集, Mar. 2014
Mar. 2014 - Mar. 2014, Japanese - 13C-NMRを用いたκ-(BEDT-TTF)2Cu[N(CN)2]Iにおける超格子構造の研究
小林拓矢; 井原慶彦; 河本充司
2014
2014 - 2014 - 30aCL-10 ^<13>C-NMR study of impurity effect in BEDT-STF doped κ-(BEDT-TTF)_2Cu[N(CN)_2]Br
Kobayashi T; Ihara Y; Kawamoto A
Meeting Abstracts of the Physical Society of Japan, 2014
Japanese - 8pAG-3 ^<13>C-NMR study of superlattice structure in κ-(BEDT-TTF)_2Cu[N(CN)_2]I
Kobayashi T; Ihara Y; Kawamoto A
Meeting Abstracts of the Physical Society of Japan, 2014
Japanese - 13C-NMR測定によるκ-(BEDT-TTF)2Cu[N(CN)2]Brの反強磁性と超伝導の研究
小林拓矢; 斉藤洋平; 井原慶彦; 河本充司
2013
2013 - 2013 - 26aXN-1 ^<13>C-NMR study of antiferromagnetism and superconductivity of к-(BEDT-TTF)_2Cu[N(CN)_2]Br
Kobayashi T; Saito Y; Ihara Y; Kawamoto A
Meeting Abstracts of the Physical Society of Japan, 2013
Japanese - Study of Superconducting Pairing Symmetry in Organic Superconductor κ-(BEDT-TTF)_2Cu(NCS)_2 Probed by In-plane Angle-resolved NMR Spectroscopy
Saito Y; Kobayashi T; Ihara Y; Kawamoto A
Meeting Abstracts of the Physical Society of Japan, 2013
Japanese
- Sep. 2020 - Present
Exercises on Experimental Physics Ⅲ, Saitama University - Apr. 2020 - Present
Exercises on Experimental Physics Ⅱ, Saitama University - Apr. 2018 - Mar. 2020
Exercises on Experimental Physics Ⅰ, Saitama University
■ Research projects
- λ型有機モット絶縁体における二つの反強磁性相に挟まれた量子常磁性相の解明
01 Apr. 2024 - 31 Mar. 2027
Grant amount(Total)：4680000, Direct funding：3600000, Indirect funding：1080000
Grant number：24K17002 - ダイマーモット有機物質における反強磁性相図の完全解明と電子型誘電体研究の新戦略
Apr. 2021 - Mar. 2024
Coinvestigator
Grant amount(Total)：4160000, Direct funding：3200000, Indirect funding：960000
Grant number：21K03438 - 有機導体における電荷異常物性の研究―核四重極共鳴によるアプローチ
01 Apr. 2020 - 31 Mar. 2023
Grant amount(Total)：4290000, Direct funding：3300000, Indirect funding：990000
Grant number：20K14401
論文ID：45679831 - Study of strongly correlated organic conductors by muon spin rotation and relaxation method under low temperatures and high pressure
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), 01 Apr. 2018 - 31 Mar. 2021
Satoh Kazuhiko; Taniguchi Hiromi; Higemoto Wataru; Kobayashi Takuya, Saitama University
Grant amount(Total)：4420000, Direct funding：3400000, Indirect funding：1020000
We developed a high-pressure cell based on NiCrAl alloy for muon spin relaxation and rotation (μSR) measurements under high pressures up to 1.5 GPa at J-PARC. First, we measured μSR on NiCrAl alloy and confirmed that the μSR spectra exhibited simple relaxation behavior and do not have temperature dependence below 150 K, which indicate that NiCrAl alloy is suitable for the lowtemperature and high-pressure μSR measurements as a material of the cylinder. Next, after inserting samples of organic antiferromagnet, β'-(BEDT-TTF)_2ICl_2 amounts to 1 g into the pressure cell, we performed μSR experiments and succeeded in detecting the μSR signal from the samples, which prove the availability of the newly developed pressure cell.
We also measured μSR on β'-(BEDSe-TTF)_2ICl and β'-(BEDSe-TTF)_2IBr_2, which are isostructural with β'-(BEDT-TTF)_2ICl_2, to get information on magnetic properties of β'-(BEDTTTF) _2ICl_2. Contrary to expectation, these materials did not exhibit muon spin rotation at low temperatures. We proposed that the muon sites of these materials are quite different from that of β'- (BEDT-TTF)_2ICl_2.
Grant number：18K03533 - λ型有機伝導体のバンド幅制御による相図の研究
Aug. 2018 - Mar. 2020
Principal investigator
Competitive research funding - Muon spin rotation studies on deuterated BEDT-TTF salts
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), 01 Apr. 2016 - 31 Mar. 2019
Taniguchi Hiromi; Kobayashi Takuya, Saitama University
Grant amount(Total)：4550000, Direct funding：3500000, Indirect funding：1050000
We determined the spin structure of k-ET2Cu[N(CN)2]Cl at a zero magnetic field by means of detailed magnetization measurements. This achievement was not expected in our proposal. Furthermore, we determined the zero-field spin structure of k-(d8-ET)2Cu[N(CN)2]Br, which has been regarded as qualitatively the same magnet as k-ET2Cu[N(CN)2]Cl, and, surprisingly, found that these two materials have different zero-field spin structures. On the basis of these new findings, we performed zero-field mSR studies on six kinds of antiferromagnets that situated in the antiferromagnetic phase of k-ET system. We detected the discontinuous change of the ratio of internal fields at around k-(d8-ET)2Cu[N(CN)2]Br salt, which means the confirmation of the change of the zero-field spin structure from the microscopic viewpoint. We also obtained the finding that two muon sites are at the molecular layers and the other one site is at the anion layers.
Grant number：16K05433 - 有機導体が示す新奇超伝導相の微視的測定手段による研究
Apr. 2016 - Mar. 2018
Principal investigator
Competitive research funding