title: Competition between phase separation and "Classical" intermediate valence in an exactly solved model
abstract: The exact solution of the spin-1 / 2 Falicov-Kimball model on an infinite-coordination Bethe lattice is analyzed in the regime of "classical" intermediate valence. We find that (i) either phase separation or a direct metal-insulator transition precludes intermediate valence over a large portion of the phase diagram, and (ii) within the intermediate valence phase, only continuous transitions are found as functions of the localized f-electron energy or temperature.
authors.affiliation: Department of Physics, Georgetown University, Washington, D.C. 20057-0995, USA.
authors.initials: W
authors.lastname: Chung
authors.initials: JK
authors.lastname: Freericks