Abstract
Using the Kotliar and Ruckenstein slave boson formalism we consider the finite-U Andersonlattice. We study the appearance of superconductivity as a function of the Coulomb repulsion, densityand f-level location for s-wave and d-wave pairing symmetries. The results extend previous studies where theinfinite-U limit was considered, confirming that superconductivity remains as the Coulomb couplingincreases, if the attractive interaction is not weak. Superconductivity disappears for largeU as the filling of the heavy particles approaches one, as expected. SinceU is finite, superconductivity occurs, in general, for any band-filling being depressed nearhalf-filling, particularly for d-wave symmetry.
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