1997/08/20 by Thomas Obermeier, Thomas Pruschke, Joachim Keller · 1 citation
Materials Science · Physics and Astronomy · #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.56.r8479
4 pages, 5 figures, accepted for publication in Physical Review B, Rapid Communications
arxiv created 1997/08/20 · openalex publication_date 1997/10/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We study the Hubbard model on a hypercubic lattice with regard to the possibility of itinerant ferromagnetism. Dynamical mean-field theory is used to map the lattice model on an effective local problem, which is treated with the help of the noncrossing approximation. By investigating spin-dependent one-particle Green's functions and the magnetic susceptibility, a region with nonvanishing ferromagnetic polarization is found in the limit U\ensuremath→\ensuremath∞. The \ensuremathδ-T phase diagram as well as thermodynamic quantities are discussed. The dependence of the Curie temperature on the Coulomb interaction and the competition between ferromagnetism and antiferromagnetism are studied in the large-U limit of the Hubbard model.