PARACONDUCTIVITY IN AN UNCONVENTIONAL LAYERED SUPERCONDUCTOR

We study the paraconductivity in an impure, unconventional layered superconductor with an underlying square lattice. The overall magnitude of the paraconductivity is found to be reduced by ordinary impurity scattering. For the case of a one-component order parameter, the paraconductivity has the same form as that of an s-wave, apart from the above mentioned reduction factor, and is independent of the coherence length in the plane. For the case of a two component order parameter, the result consists of two parts, the first being simply twice the one component result, the second nonnegative one arising only when the eigenvalues or the eigenvectors of the gradient term in the free energy cannot be chosen to be independent of the angle in the plane. © 1990 Plenum Publishing Corporation.