“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 within the Dynamical Mean Field Theory. We find that the number of electronic states available for screening near the Fermi surface have decreased, a direct confirmation of the exhaustion principle, and find evidence for suppression of the coherence temperature in the lattice case as compared to the Kondo scale in the single impurity picture. The IPT results are in qualitative agreement with recent Quantum Monte Carlo results for the same problem. Our study also elucidates the different roles played by lattice coherence and exhaustion in the suppression of the coherence temperature. PACS. 71.28 – Narrow–band systems, heavy fermion metals: intermediate– valence solids. PACS. 72.15Q – Scattering mechanisms and Kondo effect Typeset using REVTEX