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We study an extended Hubbard model in the limit of infinite dimensions andits zero dimensional counterpart, a generalized asymmetric Anderson model. Inthe impurity model we find three kinds of mixed valence states: a) the usualstrong coupling state in which a resonance forms at the Fermi level; b) a weakcoupling state in which neither the impurity spin nor the impurity chargedegrees of freedom is quenched; and c) an intermediate coupling state where thespin but not the charge degree of freedom is quenched. The corresponding phasesof the extended Hubbard model in infinite dimensions are a) a Fermi liquid; b)a non-Fermi liquid state with incoherent charge and spin excitations; and c) anon-Fermi liquid state with incoherent charge but coherent spin excitations.The non-Fermi liquid phases are incoherent metallic states with vanishingquasiparticle residue, self-similar local correlation functions, andasymptotically decoupled charge and spin excitations. The non-Fermi liquidphases occur for a wide range of parameters.Comment: 56 pages, REVTE

Metallic non-Fermi-liquid phases of an extended Hubbard model in infinite dimensions