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Pairing anisotropy and macroscopic anisotropy of superconductors.

Macroscopic properties of the superconductivity are investigated in the tight-binding picture taking account of the intersite pairing as well as the on-site pairing. We discuss the case of a layered material, a cubic material, and a quasi-one-dimensional material. A multicomponent Ginzburg-Landau equation, which takes the intersite-pairing effect into account as the different components of the order parameter, is derived from a microscopic theory. The angle dependence of the upper-critical field {ital H}{sub {ital c}2} is analyzed based on that equation and how the intersite interactions affect the anisotropy of {ital H}{sub {ital c}2} is clarified. The Fermi-energy dependence of the transition temperature {ital T}{sub {ital c}}, which does not simply reflect the density of states, is also discussed.