On the effect of strong electron correlations on various superconductivity mechanisms

✍ Scribed by A.O. Anokhin; V.Yu. Irkhin; M.I. Katsnelson

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 417 KB
• Volume: 179
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(91)90025-t

✦ Synopsis

The Eliashberg equations for singlet pairing are derived taking into account the many-electron renormalization of one-particle Green functions in the normal state of a highly correlated system. The electron-phonon and exciton superconductivity mechanisms, and influence of magnetic impurities on Tc are investigated. It is demonstrated that the "usual" superconductivity mechanisms are not influenced by correlation effects, if the Fermi-liquid picture holds, but they are strongly suppressed in the "'marginal" Fermi-liquid. In the Mort-Hubbard systems with a strong electron damping at EF, described by Hubbard-III type approximations, the electron-phonon interaction cannot lead to superconductivity.