Abstract
The Eliashberg theory generalized using peculiar properties of two-band electron–phonon (EP) systems is employed for studying T c in two-band materials (in particular, pnictides). In view of probably strong EP coupling, we take into account pairing within the entire width of the electron band, not only in a narrow layer at the Fermi surface. It is found that the effect of pairing of electrons belonging to different bands is a decisive factor for manifestation of the effect of high T c in these materials. It is shown that in materials analogous to pnictides, high T c values are reproduced by the two-band spectral function of electron–phonon interaction. The existence of one more family of two-band high-temperature materials with a superconducting transition temperature T c comparable to that in cuprates is predicted.
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Original Russian Text © E.A. Mazur, V.M. Dubovik, 2015, published in Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2015, Vol. 148, No. 1, pp. 63–74.
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Mazur, E.A., Dubovik, V.M. High-temperature superconductivity in two-band materials with interband pairing. J. Exp. Theor. Phys. 121, 54–64 (2015). https://doi.org/10.1134/S1063776115060114
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DOI: https://doi.org/10.1134/S1063776115060114