| Project/Area Number |
23540414
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Multi-year Fund |
|---|
| Section | 一般 |
|---|
| Research Field |
Condensed matter physics II
|
|---|
| Research Institution | Ehime University |
|---|
Principal Investigator |
|
|---|
| 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)
|
|---|
| Project Period (FY) |
2011 – 2013
|
| Project Status |
Completed (Fiscal Year 2013)
|
| Budget Amount *help |
¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2013: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2012: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2011: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
|
|---|
| Keywords | 奇周波数超伝導 / 常磁性マイスナー効果 / エルミート性 / 偶奇振動数ペア混合状態 / 自由エネルギー汎関数 / 偶奇周波数混合 |
|---|
| 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.
|
