MULTIPLET EFFECTS IN THE QUASI-PARTICLE BAND-STRUCTURE OF THE F(1)-F(2) ANDERSON MODEL

In this paper, we examine the mean-field electronic structure of the f1-f2 Anderson lattice model in a slave-boson approximation, which should be useful in understanding the physics of correlated metals with more than one f electron per site such as uranium-based heavy-fermion superconductors. We find that the multiplet structure of the f2 ion acts to quench the crystal-field splitting in the quasiparticle electronic structure. This is consistent with experimental observations in such metals as UPt3. © 1995 The American Physical Society.