A NEW METHOD FOR INCLUDING LOCALLY BASED CORRELATIONS IN THE ELECTRONIC-STRUCTURE OF CERIUM AND URANIUM MATERIALS

We discuss certain general features introduced by f to p/d hybridizati on acting together with coulomb exchange in systems having strong on-s ite f-f coulomb repulsion. A systematic treatment of the consequences of hybridization and coulomb exchange quite naturally leads to a pictu re in which narrow bands of predominantly f composition with competing singlet-like and magnetic characters lie on top of broad bands of pre dominantly p-d character. In this picture, on taking account of the tw o-body correlations built into the narrow bands and properly including the temperature dependence of the chemical potential, one obtains the rmodynamic properties, such as the specific heat and susceptibility, t hat change over in behavior at characteristic temperatures correspondi ng to the narrow-band width determined by the locally acting hybridiza tion/coulomb exchange interactions. This is without the need to invoke some specifically resonant state interaction between the f-states and a collective state of the p/d band electrons.