Quasiparticle states in f-electron compounds from the multiband Hubbard model

Dynamical effects included by means of a screened interaction are taken into account for determining the behavior of heavy electrons. This screened interaction yields a self-energy which for high frequencies is equal to the Hartree-Fock approximation, but that strongly depends on in the vicinity of EF. This fact can justify the large enhancements of the electronic masses and specific heat as well as the multipeaked f-electron structure which are characteristics of Hubbard systems. © 1989 The American Physical Society.