2013 Fiscal Year Final Research Report
Rattling phenomena in the beta-pyrochlore oxides and related compounds
| Project/Area Number |
22340092
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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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 |
HIROI Zenji 東京大学, 物性研究所, 教授 (30192719)
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| Co-Investigator(Kenkyū-buntansha) |
OKAMOTO Yoshihiko 東京大学, 物性研究所, 助教 (90435636)
YAMAURA Junichi 東京大学, 物性研究所, 助教 (80292762)
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| Project Period (FY) |
2010-04-01 – 2014-03-31
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| Keywords | ラットリング / 超伝導 / カゴ状化合物 |
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| Research Abstract |
Rattling is the local vibration of a relatively small atom/ion encapsulated in an atomic cage in a crystal and strongly interacts with surrounding electrons on the cage owing to the unusually large amplitude of the vibration associated with the anharmonicity. This electron-rattling interaction causes a strong-coupling superconductivity and a large mass enhancement of conduction electrons. We have focused on a typical cage compound beta-pyrochlore oxides and studied the rattling phenomena through crystal growth, structural analyses and physical property measurements. We have successfully obtained experimental evidence to show the essential feature of the rattling.
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