The ratio of the energy gap ɛ(0) for T = 0 to the transition temperature T c, the value of energy gap ɛ(T) near T c, and the expression for the transition temperature are calculated within the framework of the strong coupling theory.
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Geilikman, B.T., Kresin, V.Z. & Masharov, N.F. Transition temperature and energy gap for superconductors with strong coupling. J Low Temp Phys 18, 241–271 (1975). https://doi.org/10.1007/BF00118156
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DOI: https://doi.org/10.1007/BF00118156