| Project/Area Number |
21740257
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Condensed matter physics II
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| Research Institution | Hiroshima University |
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Principal Investigator |
HASEGAWA Takumi Hiroshima University, 大学院・総合科学研究科, 助教 (20508171)
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| Project Period (FY) |
2009 – 2010
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| Project Status |
Completed (Fiscal Year 2010)
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| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2010: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2009: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
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| Keywords | 強相関電子系 / ラットリング / パイロクロア酸化物 / ラマン分光 / 非調和相互作用 / 格子振動 |
|---|
| Research Abstract |
Alkaline atoms in the β-pyrochlore oxides vibrate with unusually large amplitude. The large amplitude vibrations are expected to take an important role in the superconducting state of the -pyrochlore oxides. In this investigation, anharmonicity of the vibrations, which characterizes the anomaly of the large amplitude vibrations, is successfully estimated, and it is revealed that K vibrations in KOs_2O_6 possess anomalously large anharmonicity. From a series of anharmonicity investigations, an important factor to affect anharmonicity has been determined, and a principle to realize large anharmonicity has been revealed.
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