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Hund's rule and metallic ferromagnetism | Juerg Froehlich
; Daniel Ueltschi
; | Date: |
21 Apr 2004 | Journal: | J. Statist. Phys. 118, 973-996 (2005) DOI: 10.1007/s10955-004-2174-y | Subject: | Strongly Correlated Electrons; Statistical Mechanics; Mathematical Physics | cond-mat.str-el cond-mat.stat-mech math-ph math.MP | Abstract: | We study tight-binding models of itinerant electrons in two different bands, with effective on-site interactions expressing Coulomb repulsion and Hund’s rule. We prove that, for sufficiently large on-site exchange anisotropy, all ground states show metallic ferromagnetism: They exhibit a macroscopic magnetization, a macroscopic fraction of the electrons is spatially delocalized, and there is no energy gap for kinetic excitations. | Source: | arXiv, cond-mat/0404483 | Services: | Forum | Review | PDF | Favorites |
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