RESIDUAL SURFACE-RESISTANCE OF YBA2CU3OX THIN-FILMS - WEAKLY COUPLED GRAIN MODEL

The residual surface resistance and the magnetic penetration depth of high-T-c superconducting YBa2Cu3Ox thin films have been measured using the coplanar waveguide resonator technique, and are discussed with th e weakly coupled grain model, where the superconducting polycrystallin e thin film is described as a network of superconducting grains couple d via Josephson junctions. The observed dependence of the residual res istance and the magnetic penetration depth on the critical current den sity and the grain size is shown to demonstrate the weakly coupled gra in model of YBa2Cu3Ox thin films.