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Ferromagnetism and metal-insulator transition in the disordered Hubbard model
Krzysztof Byczuk1, Martin Ulmke, Dieter Vollhardt
1Theoretical Physics III, Center for Electronic Correlations and Magnetism, Institute for Physics, University of Augsburg, D-86135 Augsburg, Germany.
Physical Review Letters
|June 6, 2003
Abstract:
A detailed study of the paramagnetic to ferromagnetic phase transition in the one-band Hubbard model in the presence of binary-alloy disorder is presented. The influence of the disorder (with concentrations x and 1-x of the two alloy ions) on the Curie temperature T(c) is found to depend strongly on electron density n. While at high densities, n>x, the disorder always reduces T(c); at low densities, n