Surface impedance and optimum surface resistance of a superconductor with an imperfect surface
Surface impedance and optimum surface resistance of a superconductor with an imperfect surface
We calculate a low-frequency surface impedance of a dirty, s-wave superconductor with an imperfect surface incorporating either a thin layer with a reduced pairing constant or a thin, proximity-coupled normal layer. Such structures model realistic surfaces of superconducting materials which can contain oxide layers, absorbed impurities or nonstoichiometric composition. We …