Exact solution of the multi-component Falicov-Kimball model in infinite dimensions

Abstract

The exact solution for the thermodynamic and dynamic properties of the infinite-dimensional multi-component Falicov-Kimball model for arbitrary concentration of d- and f-electrons is presented. The emphasis is on a descriptive derivation of important physical quantities by the equation of motion technique. We provide a thorough discussion of the f-electron Green function and of the susceptibility to spontaneous hybridization. The solutions are used to illustrate different physical systems ranging from the high-temperature phase of the YbInCu4 family of materials to an examination of classical intermediate valence systems that can develop a spontaneous hybridization at T=0.

30 pages, 9 figures, LaTeX, Proceedings of Autumn School in Debrecen, Hungary, 2000, to appear in Phil. Mag. B