Anisotropic Energy Gap in Superconducting White Tin: Semiempirical Approach

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Abstract
The anisotropic energy gap in superconducting tin is found in terms of an expansion in tetragonal harmonics. The anisotropy coefficients are determined from a selection of Zavaritskii's single-crystal tunneling data by means of some results of a previous calculation of the anisotropic gap in lead. In particular, generalization of the latter work makes possible the separation of the contributions of different sheets of the Fermi surface to the tunneling current. The calculated gap variation is compared with that found in tunneling, acoustic attenuation, and infrared absorption experiments.