Valence transition in the periodic Anderson model
| dc.creator | Huebsch, A. | |
| dc.creator | Becker, K. W. | |
| dc.date | 2005-04-07 | |
| dc.date | 2006-05-02 | |
| dc.date.accessioned | 2026-07-07T06:37:40Z | |
| dc.date.available | 2026-07-07T06:37:40Z | |
| dc.description | 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 \textit{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 \textit{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. | |
| dc.description | 9 pages, 3 figures included; v2: completely revised and extended version | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0504188 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0504188 | |
| dc.identifier | Eur. Phys. J. B 52, 345 (2006) | |
| dc.identifier | doi:10.1140/epjb/e2006-00303-x | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/100472 | |
| dc.subject | Strongly Correlated Electrons | |
| dc.title | Valence transition in the periodic Anderson model | |
| dc.type | text |