Microscopic theory for odd-frequency superconductivity in critical region

临界区奇频超导的微观理论

• 批准号: 23540414
• 负责人: KUSUNOSE Hiroaki
• 金额: $ 2.16万
• 依托单位: Ehime University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011 至 2013
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23540414/
• 关键词: 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

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.

我们已经发展了奇频超导的基本理论。我们发现，一个自洽的体态是可能的，通过选择一个适当的序参数，最大限度地减少自由能功能的自发对称性破缺。阐明了强耦合局域电子-声子模型和具有临界磁涨落的模型，确定了温度和参数空间的相图。临界涨落与几何发散吸引力使其对自能效应是稳定的。通过求解具有这种边界条件的自洽方程，我们进一步研究了在杂质位附近或表面边界上出现奇频分量的机制，并揭示了对序参量性质的微观理解和半唯象理解之间的关系.

项目成果

強磁性超伝導体における自己誘起磁束格子の理論

铁磁超导体自感磁通晶格理论

• 发表时间: 2013
• 作者: K. Ishii;F. Iga;et al;楠瀬博明
• 通讯作者: 楠瀬博明

When superconductivity meets magnetism

当超导遇到磁性

• 发表时间: 2012
• 作者: K. Hayashi;F. Iga;et al;H. Kusunose
• 通讯作者: H. Kusunose

Theory for self-induced vortex phase in ferromagnetic superconductors

铁磁超导体自感涡流相理论

• 发表时间: 2013
• 作者: 伊賀文俊;他;H. Kusunose
• 通讯作者: H. Kusunose

Spontaneous spatial inversion symmetry breaking in honeycomb lattice

蜂窝晶格中自发空间反演对称性破缺

• 发表时间: 2013
• 作者: 佐藤仁;他;伊賀文俊;岡村英一;H. Kusunose
• 通讯作者: H. Kusunose

Theory of Self-Induced Vortex State in Ferromagnetic Superconductors

铁磁超导体自感涡旋态理论

• DOI: 10.7566/jpsj.82.094711
• 发表时间: 2013
• 期刊: J. Phys. Soc. Jpn
• 作者: H. Kusunose;Y. komoto
• 通讯作者: Y. komoto