| Budget Amount *help |
¥26,260,000 (Direct Cost: ¥20,200,000、Indirect Cost: ¥6,060,000)
Fiscal Year 2015: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2014: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2013: ¥17,420,000 (Direct Cost: ¥13,400,000、Indirect Cost: ¥4,020,000)
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| Outline of Final Research Achievements |
Our study revealed the following novel quantum states in correlated electron systems. (1) In the valence fluctuating system β-YbAlB4, we found that a quantum criticality is stable in the finite range of pressure and appears without magnetic criticality, suggesting a formation of a strange metal phase due to strong valence fluctuations. Secondly, our success in growing a high quality single crystal of the quadrupolar heavy fermion system PrV2Al20 lead us to discover that PrV2Al20 exhibits a heavy fermion superconductivity in the anti-quadrupolar ordered phase. Furthermore, our pressure measurements found that this superconductivity is most likely driven by the quantum critical quadrupolar fluctuations. (2) In our studies on Ba3CuSb2O9, we reported the first observation of striking absence of the static Jahn-Teller distortion down to the lowest temperature, and the first determination of dynamic Jahn-Teller frequencies, indicating the formation of a quantum spin-orbital liquid state.
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