2012 Fiscal Year Final Research Report
Theory of exotic quantum order and novel superconductivity emerging from multi degrees of freedom of f electron
| Project Area | Emergence of Heavy Electrons and Their Ordering |
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| Project/Area Number |
20102008
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| Research Category |
Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
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| Allocation Type | Single-year Grants |
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| Review Section |
Science and Engineering
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| Research Institution | Tokyo Metropolitan University |
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Principal Investigator |
HOTTA Takashi 首都大学東京, 大学院・理工学研究科, 教授 (00262163)
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| Co-Investigator(Kenkyū-buntansha) |
KUSUNOSE Hiroaki 愛媛大学, 理工学研究科, 准教授 (00292201)
SHIBATA Naokazu 東北大学, 理学研究科, 准教授 (40302385)
OSHIKAWA Masaki 東京大学, 物性研究所, 教授 (50262043)
KONTANI Hiroshi 名古屋大学, 理学研究科, 教授 (90272533)
KAWAKAMI Norio 京都大学, 理学研究科, 教授 (10169683)
KURAMOTO Yoshio 東北大学, 理学研究科, 教授 (70111250)
UEDA Kazuo 東京大学, 物性研究所, 教授 (70114395)
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| Co-Investigator(Renkei-kenkyūsha) |
MIYAKE Kazumasa 大阪大学, 基礎工学研究科, 教授 (90109265)
OGATA Masao 東京大学, 理学研究科, 教授 (60185501)
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| Project Period (FY) |
2008 – 2012
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| Keywords | 重い電子 / 超伝導 / 磁性 / 軌道縮退 / ラットリング |
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| Research Abstract |
Heavy electron phenomena emerge in rare-earth and actinide compounds, when f electron exhibits huge effective mass which is a few hundred or thousand times as large as the bare electron mass. Thus far, the heavy electron state has been understood by the competition between itinerant and localized nature of f electron. In this research, we have clarified new heavy-electron mechanisms due to multi degrees of freedom such as f-electron orbital and phonon in addition to spin and charge. We have also developed the theory of ordering of multipole as spin-orbital complex, quantum criticality due to valence fluctuations, superconductivity due to anharmonic phonons, and orbital-fluctuation-induced superconductivity in orbital degenerate systems.
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