Spin fluctuation superconductivity beyond Migdal theorem in Hubbard systems in the pseudogap regime
Grup d'Electromagnetisme, Departament de Física,
Edifici Cn Universitat Autònoma de Barcelona -
08193 Bellaterra (Barcelona), Spain
Accepted: 24 November 1995
We study a strong-coupling theory beyond the Migdal theorem, considering a spin fluctuation coupling potential within an s-wave symmetry in strongly correlated systems in a pseudogap regime. The influence of vertex effects on both the potential and the solutions of the resulting Eliashberg-like equations is discussed for the different band conditions and coupling strength.
PACS: 71.27.+a – Strongly correlated electron systems / 74.20.-z – Superconductivity Theory
© EDP Sciences, 1996