Superconductivity in two-band non-adiabatic systems

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dc.creatorPalistrant, M. E.
dc.creatorUrsu, V. A.
dc.date2006-02-23
dc.date2006-04-27
dc.date.accessioned2026-07-07T07:01:54Z
dc.date.available2026-07-07T07:01:54Z
dc.descriptionTheory of superconductivity in two-band non-adiabatic systems with strong electron correlations in the linear approximation over non-adiabaticity is built in the article. Having assumed weak electron-phonon interaction analytical expressions for the vertex functions and "intersecting " functions for each energy band are obtained. Mass operators of Green functions with account of diagrams with intersection of two lines of electron- phonon interaction (exceeding the frameworks of Migdal theorem) are derived as well as main equations of theory of superconductivity in two-band systems. Analytical formulas for the temperature of superconducting transition Tc are obtained as well as renormalization of the quantities which enter these formulas because of effects of non-adiabaticity and strong electron correlations. Dependence of Tc and coefficient of isotope effect on Migdal parameter m is studied. Overlapping of energy bands on Fermi surface with effects of non-adiabaticity at low values of transferred momentum is shown to obtain high values of Tc even assuming weak electron-phonon interaction.
dc.description17 pages, 3 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0602551
dc.identifierhttp://arxiv.org/abs/cond-mat/0602551
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/108422
dc.subjectSuperconductivity
dc.titleSuperconductivity in two-band non-adiabatic systems
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