Transition temperature of strong-coupling superconductors

O.V. Dolgov^a, b, E.G. Maksimov^a
^aLebedev Physical Institute, Russian Academy of Sciences, Leninsky prosp. 53, Moscow, 119991, Russian Federation
^bMax-Planck Institut für Festkörperforschung, Stuttgart, Germany

The possible existence of superconductors with high transition temperatures is analyzed for both the ordinary electron-phonon interaction and nonphonon superconductivity mechanisms. The existence of such systems depends on a negative static dielectric permittivity. The possible occurrence of this situation for an electron-ion system is analyzed. It is shown that negative values of the static dielectric permittivity are possible in the case of strong local-field effects, i. e., in the case of exchange-correlation interactions in the electron subsystem or the localization of point ions for an electron-phonon system. Equations for the transition temperature of strong-coupling superconductors are analyzed. Restrictions imposed on the transition temperature by the equations themselves and by the conditions for stability of the material are examined.

PACS: 74.10.+v
DOI: 10.1070/PU1982v025n09ABEH004602
URL: https://ufn.ru/en/articles/1982/9/c/
Citation: Dolgov O V, Maksimov E G "Transition temperature of strong-coupling superconductors" Sov. Phys. Usp. 25 688–704 (1982)

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Оригинал: Долгов О В, Максимов Е Г «Критическая температура сверхпроводников с сильной связью» УФН 138 95–128 (1982); DOI: 10.3367/UFNr.0138.198209c.0095

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