Magnetocaloric-effect study on quantum-spin-liquid states of organic triangular-lattice systems
| Project/Area Number |
15K05188
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Condensed matter physics II
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| Research Institution | Institute of Physical and Chemical Research (2016-2017)
National Institute for Materials Science (2015) |
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Principal Investigator |
Isono Takayuki 国立研究開発法人理化学研究所, 加藤分子物性研究室, 特別研究員 (70625631)
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2015: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Keywords | 量子スピン液体 / 三角格子有機磁性体 / 磁気熱量効果 |
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| Outline of Final Research Achievements |
In order to systematically understand magnetic excitations in quantum spin-liquid states of organic triangular-lattice magnets, we performed torque magnetometry and magnetocaloric-effect study on kappa-(BEDT-TTF)2Cu2(CN)3. We found from the torque magnetometry that the magnetic susceptibility is scaled in the wide temperature and field region, which unveils the zero-field quantum criticality, and the value of the critical exponents. The magnetocaloric-effect measurements revealed that the electron-spin system is decoupled from the lattice bath at low temperature and in magnetic field. This spin-lattice decoupling phenomenon well explains the discrepancy of the low-energy excitation spectrum of kappa-(BEDT-TTF)2Cu2(CN)3. The present results provide the unified understanding to the macroscopic properties of the quantum spin-liquid states in the organic triangular-lattice systems.
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Report
(4 results)
Research Products
(13 results)
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[Journal Article] Fulde-Ferrell-Larkin-Ovchinnikov superconductivity in the layered organic superconductor b”-(BEDT-TTF)4[(H3O)Ga(C2O4)3]C6H5NO22018
Author(s)
S. Uji, Y. Iida, S. Sugiura, T. Isono, K. Sugii, N. Kikugawa, T. Terashima, S. Yasuzuka, H. Akutsu, Y. Nakazawa, D. Graf, P. Day
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Journal Title
Phys. Rev. B
Volume: 97
Issue: 14
Pages: 144505-144505
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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