Muratov

  The possibility impurity resonant scattering in superconductors is discussed. Within the framework of  scattering approach on the basis of the experimental data by thermal conductivity has suggested the method of determination of the resonant level. The analytical expressions for time relaxation and thermal conductivity are obtained. The formula for calculation of the resonant level over the maximal value of thermal conductivity has established. It’s shown that the Bardeen, Rickaysen and Tewordt’s result corresponds to ultimate case of impurity resonant scattering.