I. M. TangMahidol University2018-06-142018-06-141987-02-23Physics Letters A. Vol.120, No.5 (1987), 246-250037596012-s2.0-45949122989https://repository.li.mahidol.ac.th/handle/20.500.14594/15476The strong coupling expression for the free energy difference of a superconductor containing strongly interacting magnetic impurities obtained by Yamamoto and Nagi is generalized so that it can be applied to anisotropic superconductors. The specific heat jump at T c is then calculated from the resulting expression within the (separable anisotropic) square well model version of the Migdal-Eliashberg formulation of superconductivity. Numerical comparison of the results obtained are made with the specific heat jump at T c obtained on the basis of a trivial extension of the Bardeen-Stephen expression for the free energy difference. © 1987.Mahidol UniversityPhysics and AstronomyArticleSCOPUS10.1016/0375-9601(87)90218-0