| 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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| 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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