An analytical result for the normalized jump of the heat capacity ∆ N / C C is derived for in-plane anisotropic s-wave superconductors within the framework of the weak-coupling BCS approach. Our results show that within the anisotropy gap model the value of ∆ N / C C must be less than the BCS value and the effect of in-plane asymmetry will reduce or increase the value of ∆ N / C C of in-plane symmetry depending on its parameters.
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