The effect of magnetic impurities in superconductors is studied by using the dispersion equations, which are simple extensions of those introduced by Suhl. In the case of a single impurity, we find that, if Tc0>Tᵣ (where Tc0 is the superconducting transition temperature and Tᵣ is the Suhl-Abrikosov resonance temperature), a pair of bound states appear in the energy gap, while if Tc0<Tᵣ, resonances appear at low temperatures. Also, self-consistent equations are constructed to treat the case of dilute concentration of impurity atoms. In the gapless region it is established that the Abrikosov-Gor'kov expressions are valid, except that τₛ in their theory must be replaced by the exact frequency-dependent spin-flip lifetime τₛ(ω) in the normal state.
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Kazumi Maki (1967) studied this question.
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