2008/08/31 by Unjong Yu, Krzysztof Byczuk, D. Vollhardt +1
Physics and Astronomy · #Magnetic properties of thin films #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.78.205118
published as PHYSICAL REVIEW B 78, 205118 (2008) · 5 pages, 4 figures (accepted for publication in Phys. Rev. B)
arxiv created 2008/10/29 · openalex publication_date 2008/11/24 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We investigate the influence of degeneracies of the conduction band and the f 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, Dc and Df, and conduction-electron densities nc within the dynamical mean-field theory. A strong increase in the Curie temperature TC with the degeneracy Df of the localized f level is found. For Dc\ensuremath≤Df a simple ansatz based on a mean-field treatment of the Ruderman-Kittel-Kasuya-Yoshida interaction is shown to imply a scaling behavior of TC as a function of the conduction-electron density per band which is well obeyed by the numerical results. In particular, TC is found to have a maximum at nc/Dc\ensuremath≈0.3.