Hund's rule and metallic ferromagnetism

Details Hund's rule and metallic ferromagnetism Hund's rule and metallic ferromagnetism

2004-04-21

arxiv.org/abs/cond-mat/0404483v2

J. Statist. Phys. 118, 973-996 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

17 pages

Scientific paper

10.1007/s10955-004-2174-y

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.

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