| Project/Area Number |
15K17691
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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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 |
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| Project Period (FY) |
2015-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2015: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
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| Keywords | 超低温物性 / 強相関電子系 / 超伝導 / 量子臨界性 / 超低温 |
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| Outline of Final Research Achievements |
The main focus of this study was to study the strongly-correlated electron systems down to unprecedented ultra-low temperatures (~1 mK); The lowest temperature of the current studies has been limited to ~50 mK. As a first step, we performed quantum oscillation measurements of the d-wave superconductor CeCoIn5 to verify the applicability of these measurements at ultra-low temperatures. Unexpectedly, we found anomalous changes in the quantum oscillation measurements at ultra-low temperatures, indicating an emergence of unknown ordered phase neighboring to the superconducting phase. Although CeCoIn5 has been inferred to be located in the vicinity of a quantum critical point (QCP), no ordered phase corresponding to the QCP has been observed. Our findings not only reveal this long-standing mystery of CeCoIn5, but also demonstrate the presence of rich physics in unexplored ultra-low temperature region.
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