Influence of Band and Orbital Degeneracies on Ferromagnetism in the Periodic Anderson Model
arXiv:0808.0079 · doi:10.1103/PhysRevB.78.205118
Abstract
We investigate the influence of degeneracies of the conduction band and the -orbital on the stability of ferromagnetism in the periodic Anderson model. To this end we calculate the temperature dependence of the inverse susceptibility for different degeneracies and conduction electron densities within the dynamical mean-field theory. A strong increase of the Curie temperature with the degeneracy of the localized -level is found. For a simple \emph{ansatz} based on a mean-field treatment of the RKKY interaction is shown to imply a scaling behavior of as a function of the conduction electron density per band which is well obeyed by the numerical results. In particular, is found to have a maximum at .
arXiv comment5 pages, 4 figures (accepted for publication in Phys. Rev. B)
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