The effects of strong coupling and of spin-flip scattering by magnetic impurities on the electromagnetic properties of superconductors are discussed. We have found that the surface resistance (RₛRN) of lead, a strong-coupling superconductor, reflects the phonon spectrum and has characteristic peaks ({~}1.02) near frequencies {~}8×{}10^-3 and 11×{}10^-3 eV, and has a small dip ({~}0.95) near frequency {~}22×{}10^-3 eV. Extensive calculations of the conductivity and surface impedance for superconductors containing magnetic impurities at finite temperatures, especially in the gapless region, are described.
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Sang Boo Nam (1967) studied this question.
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