Hund's rule and metallic ferromagnetism
Strongly Correlated Electrons
2007-05-23 v2 Statistical Mechanics
Mathematical Physics
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.
Keywords
Cite
@article{arxiv.cond-mat/0404483,
title = {Hund's rule and metallic ferromagnetism},
author = {Juerg Froehlich and Daniel Ueltschi},
journal= {arXiv preprint arXiv:cond-mat/0404483},
year = {2007}
}
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17 pages