G. Haran et al., IMPURITY SCATTERING EFFECT ON THE SPECIFIC-HEAT JUMP IN ANISOTROPIC SUPERCONDUCTORS, Physical review. B, Condensed matter, 55(17), 1997, pp. 11778-11784
The specific-heat jump at a normal-superconducting phase transition in
an anisotropic superconductor with nonmagnetic impurities is calculat
ed within a weak-coupling mean-field approximation. It is shown that i
ts dependence on the impurity concentration is remarkably different fo
r d(x2-y2)-wave and (d(x2-y2)+s)-wave states. This effect may be used
as a test for the presence of an s-wave admixture in the cuprates.