Dynamic Potentials for Unstable Narrow Band Systems. Application to Intermediate Valence and Heavy Fermion Compounds

The one‐body propagator for interacting systems with strongly correlated electrons is determined. The self‐energy functional is constructed from a GW approximation and a self‐consistent procedure is given for determining the electronic structure of the f systems (4f and 5f). The method is applied to the intermediate valence phase of SmS and to UAl2 which is a heavy fermion compound. The resulting electronic structure is compared with available experimental results. The obtained density of states presents reasonable agreement with these results. Copyright © 1988 WILEY‐VCH Verlag GmbH & Co. KGaA