We discuss the surface impedance (Z=R-iX) of a normal-metal/superconductorproximity structure taking into account the spin-dependent potential at thejunction interface. Because of the spin mixing transport at the interface,odd-frequency spin-triplet s-wave Cooper pairs penetrate into the normal metaland cause the anomalous response to electromagnetic fields. At low temperature,the local impedance at a surface of the normal metal shows the nonmonotonictemperature dependence and the anomalous relation R>X. We also discuss apossibility of observing such anomalous impedance in experiments.
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