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We consider a two‐band superconductor (SC) whose order parameter (OP) components in each band are constants of opposite sign. Conduction electrons interact with impurities described by the Anderson model. We calculate the density of states (DOS) of this system within a mean‐field slave‐boson approximation. The position of impurity‐induced states in the energy gap depends strongly on the relative size...
We consider the superconducting state of symmetry with finite concentration of Anderson impurities in the limit $\Delta _s /\Delta _d \ll 1$. The model consists of a BCS‐like term in the Hamiltonian and the Anderson impurity treated in the self‐consistent large‐N mean field approximation. Increasing impurity concentration or lowering the ratio drives the system through a...
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