On the basis of an approach associated with the concept of Bogolyubov quasimeans, a model is proposed allowing the coexistence of normal and superconducting components in superconductors at subcritical temperatures to be described. The corresponding phase concentrations are determined in a self-consistent manner as a function of the temperature and the parameters of the interaction. In the approximation of strongpairing and constant four-fermion interaction, expressions are obtained for the phase concentrations and order parameter. The difference from the standard BKSh theory is considered.
Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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