GINZBURG-LANDAU IMPURITY TERMS FOR UNCONVENTIONAL SUPERCONDUCTORS

The Ginzburg-Landau theory of superconductivity provides expressions f or the free energy and the supercurrent in terms of a spatially varyin g order parameter. In tile presence of a single impurity, these expres sions and the differential equation for the order parameter are supple mented by additional terms. We compute these extra terms using microsc opic theory. Our calculation is very general, covering any (k) over ca p-dependent order parameter Delta((k) over cap) which transforms accor ding to a one-dimensional irreducible representation of the crystallin e point group.