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1982

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Transition temperature of strong-coupling superconductors

 a, b,  a
a Lebedev Physical Institute, Russian Academy of Sciences, Leninsky prosp. 53, Moscow, 119991, Russian Federation
b Max-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.

Fulltext pdf (825 KB)
Fulltext is also available at DOI: 10.1070/PU1982v025n09ABEH004602
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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