Influence of Coulomb interactions on the properties of induced pairing model

We study the superconducting properties of a model of coexisting itinerant carriers and local pairs with finite binding energy, taking into account th e effects of Coulomb (density-density) and direct pair hopping interactions . The evolution of the phase diagrams and superfluid characteristics with e lectron concentration, interaction parameters and the relative position of the bands is examined. The model is found to exhibit several kinds of super conducting behaviors ranging from the BCS-like to the local-pair-like. The relevance of the obtained results to the interpretation of experimental dat a for the doped bismuthates (Ba1-xKxBiO3 and BaPb1-xBiO3) is pointed out.