"Exhaustion" physics in the periodic Anderson model from iterated perturbation theory

We discuss the "exhaustion" problem in the context of the periodic Anderson model using iterated perturbation theory (IPT) within the dynamical mean-f ield theory. WE find that, despite its limitations, IPT captures the exhaus tion physics, which manifests itself as a dramatic, strongly energy-depende nt, suppression of the effective hybridization of the self consistent Ander son impurity problem. As a consequence, low-energy scales in the lattice ca se are strongly suppressed compared to the "Kondo scale" in the single impu rity picture. The IPT results are in qualitative agreement with recent Quan tum Monte Carlo results for the same problem.