2011 Fiscal Year Final Research Report
NQR Study of Superconducting Mechanism mediated by Valence Fluctuations
| Project/Area Number |
21540338
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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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 | Shimane University |
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Principal Investigator |
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| Project Period (FY) |
2009 – 2011
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| Keywords | 磁気共鳴 / 超伝導 |
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| Research Abstract |
We study mechanism of exotic superconductivity in strongly correlated electron system under high pressure, and challenge to elucidate novel pairing interactions(valence and/or orbital fluctuations), resulting in strong coulomb interaction between the electrons. NQR frequency(^<63>ν_Q) for^<63> Cu nuclei in CeCu_2Si_2 deviates from the linear pressure dependence. The observed downward deviation of^<63>ν_Q is associated with increase of Ce valence. Above 4. 5 GPa, the linear relation of^<63>ν_Q is observed again, closely related to sharp crossover to high valence state.
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