ELECTRODYNAMIC RESPONSE IN CUPRATE SUPERCONDUCTORS

We present results from a microscopic theory of the electrodynamic res ponse (E parallel to ($) over cap c) in high-T-c superconductors for a n array of coupled superconducting layers. In this model each layer is described by a two-dimensional Fermi liquid, and interlayer coupling is mediated by thermally activated incoherent scattering processes. We discuss the surface resistance in the c-direction and show that a d-s tate symmetry of the order parameter leads to an anomalous T-dependenc e at frequencies below, Delta(0) and imposes rather stringent conditio ns on the interlayer coupling.