On the theory of nonlinear electrical conductivity of superconducting point contacts containing magnetic impurities

The nonlinear electrical conductivity of superconducting S–c–N point contacts containing magnetic impurities is investigated. It is shown that the temperature dependence of excess current changes from the root to a linear mode for T→Tc with increasing concentration of magnetic impurities. At the same time, the singularity on the nonlinear conductivity of the contact is blurred and shifted towards lower energies. In the gapless case, the excess current remains nonzero, but is not determined any longer by the energy gap width which is equal to zero in this region.

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