Abstract
Various possible types of interband pairings in mixed valence and heavy fermion systems are investigated, using a two-band model with Kondo-type interaction. In this model, the system may develop interband singlet superconducting ordering, or electron-hole pairing of excitonic type, which induces an effectivef − d hybridization. The conditions for the realization of each of these orderings depends crucially on the dispersion of the corresponding original bands. The mutual influence of the two pairings, as well as the effect of “external” hybridization, are investigated.
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