Hybridized Nondegenerate6dand5fVirtual-Bound-States Model for Actinides Metals

A simple model taking into account two hybridized and nondegenerate $6d$ and $5f$ virtual bound states is presented here for describing the properties of pure actinide metals. The model which describes the $d-f$ hybridization by a simple mixing one-body Hamiltonian is treated in the usual Hartree-Fock self-consistent scheme of Friedel-Anderson. The model can be made consistent with previous band calculations and with specific-heat measurements giving a large density of states at the Fermi level. It can then account for the absence of localized magnetism for the strongly $d-f$ hybridized uranium, neptunium, and plutonium metals and for the occurrence of magnetism only in the middle of the series for curium and berkelium.