Electrodynamics of Superconducting Alloys in High Magnetic Fields

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Abstract
The surface impedance of the superconducting alloys in high magnetic fields is explicitly calculated by restricting consideration to the critical region where the order parameter is small. It is shown that we have an expression for the complex conductivity equivalent to that for superconductors containing paramagnetic impurity, as long as we are concerned with gapless region. A brief discussion is given on the complex conductivity in the weak-field region where the low-lying excitations associated with each flux line play a dominant role.