Abstract
An attempt is made of collecting reliable information from microscopic models, which may be relevant to the problem of heavy fermion superconductivity. For this purpose direct perturbation theory with respect to hybridization between band states and local states is used to cope with the influence of strong local correlations in lattice periodic systems.1,2 Results taken into account concern the one-particle excitation spectra and the collective behavior, resulting from quasiparticle interactions, of such lattice systems. We discuss the prospects of electronic and phononic mechanisms for superconductivity and the possible resulting symmetry of the order parameter. The particular difficulties found in a microscopic treatment of superconductivity in heavy Fermion systems are pointed out and compared to standard BCS theory.
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