Superconductivity of the Induced Pairing Model in the Presence of Diagonal Disorder

We analyze the influence of randomness of local pair (LP) site energies on the superconducting properties of a mixture of coexisting local pairs and itinerant electrons coupled via charge exchange mechanism. It has been found that the diagonal disorder effects depend in a crucial way on the total particle concentration n and the LP level position ₀. Depending on the parameters, the system can exhibit various types of superconducting behaviors, including the LP-like, intermediate (MIXED), and the BCS-like.