Valence transition in the periodic Anderson model

A. Hübsch () and K. W. Becker

The European Physical Journal B: Condensed Matter and Complex Systems, 2006, vol. 52, issue 3, 345-353

Abstract: A very rich phase diagram has recently been found in CeCu 2 Si 2 from high pressure experiments where, in particular, a transition between an intermediate valence configuration and an integral valent heavy fermion state has been observed. We show that such a valence transition can be understood in the framework of the periodic Anderson model. In particular, our results show a breakdown of a mixed-valence state which is accompanied by a drastic change in the f occupation in agreement with experiment. This valence transition can possibly be interpreted as a collapse of the large Fermi surface of the heavy fermion state which incorporates not only the conduction electrons but also the localized f electrons. The theoretical approach used in this paper is based on the novel projector-based renormalization method (PRM). With respect to the periodic Anderson model, the method was before only employed in combination with the basic approximations of the well-known slave-boson mean-field theory. In this paper, the PRM treatment is performed in a more sophisticated manner where both mixed as well as integral valent solutions have been obtained. Furthermore, we argue that the presented PRM approach might be a promising starting point to study the competing interactions in CeCu 2 Si 2 and related compounds. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2006

Keywords: 71.10.Fd Lattice fermion models (Hubbard model, etc.), 71.27.+a Strongly correlated electron systems; heavy fermions, 75.30.Mb Valence fluctuation, Kondo lattice, and heavy-fermion phenomena, (search for similar items in EconPapers)
Date: 2006
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DOI: 10.1140/epjb/e2006-00303-x

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