| Project/Area Number |
15K13523
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Condensed matter physics II
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| Research Institution | The University of Tokyo |
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Principal Investigator |
KITAGAWA Kentaro 東京大学, 大学院理学系研究科(理学部), 講師 (90567661)
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| Co-Investigator(Kenkyū-buntansha) |
松林 和幸 電気通信大学, 大学院情報理工学研究科, 准教授 (10451890)
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| Research Collaborator |
TAKAGI HIDENORI 東京大学, 大学院理学系研究科, 教授 (40187935)
TAKAYAMA TOMOHIRO Max Planck Institute for Solid State Research, Department of Quantum Materials, Scientist
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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 |
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2015: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Keywords | 超高圧技術 / 核磁気共鳴 / スピン液体 / 重い電子系 / Ir化合物 / Yb化合物 / 高圧技術 / キタエフ系 / 強相関電子系 / 超高圧 / 新物質開発 / 量子臨界現象 |
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| Outline of Final Research Achievements |
We have investigated new structure material, which we discovered previously, and ultrahigh-pressure new phenomena for various materials. We have drawn a pressure-temperature phase diagram for a new material YbCo2Ge4, and found that a quantum critical point is located at as low as 1GPa. Next, we focused on Kitaev quantum spin liquid, which has attracted a lot of attention when we started this program. We discovered the first spin liquid material H3LiIr2O6 as a candidate for such a liquid, where it exhibits paramagnetism down to 50mK and peculiar Dirac-like fermionic dispersions. In a cousin hyperhoneycomb-type beta-Li2IrO6 compound, we reported a competition between the magnetic phase and spin-singlet dimer formation under ultrahigh pressures.
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