Pj. Hirschfeld, IMPURITY SCATTERING AND ORDER-PARAMETER SYMMETRY IN HIGH-T-C SUPERCONDUCTORS, Journal of physics and chemistry of solids, 56(12), 1995, pp. 1605-1610
I review the theory of impurities in a d-wave superconductor, with a v
iew towards devising tests which can identify the order parameter symm
etry in the cuprates particularly those involving electromagnetic resp
onse. Existing microwave data can be semiquantitatively fit by ''dirty
d-wave'' theory, extended to include inelastic scattering by antiferr
omagnetic spin fluctuations although some discrepancies remain. The mo
del also yields alternative explanations for some well-known features
of the optical conductivity in single crystals. The theory is compared
with the predictions for various anisotropic s-wave states which have
been proposed recently.