2013 Fiscal Year Final Research Report
Microscopic theory for odd-frequency superconductivity in critical region
| Project/Area Number |
23540414
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Condensed matter physics II
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| Research Institution | Ehime University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
MATSUMOTO Masashige 静岡大学, 理学研究科, 教授 (20281058)
KOGA Mikito 静岡大学, 教育学部, 教授 (40324321)
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| Project Period (FY) |
2011 – 2013
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| Keywords | 奇周波数超伝導 / 常磁性マイスナー効果 / エルミート性 |
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| Research Abstract |
We have developed the fundamental theory for odd-frequency superconductivity. We found that a self-consistent bulk state is possible by choosing an appropriate order parameter that minimizes the free-energy functional in a spontaneous symmetry breaking. We elucidated the strong-coupling local electron-phonon model and the model having a critical magnetic fluctuation, we determined the phase diagram in temperature and parameter space. The critical fluctuation with logarithmically divergent attraction makes it stable against the self-energy effect. We further investigated the mechanism of the appearance of the odd-frequency component near an impurity site or on a surface boundary by solving the self-consistent equations with such boundary conditions, and showed the relationship between the microscopic and semi-phenomenological understandings for the nature of the order parameters.
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