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Condensed Matter > Strongly Correlated Electrons

arXiv:cond-mat/0404483 (cond-mat)
[Submitted on 21 Apr 2004 (v1), last revised 10 Nov 2004 (this version, v2)]

Title:Hund's rule and metallic ferromagnetism

Authors:Juerg Froehlich, Daniel Ueltschi
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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.
Comments: 17 pages
Subjects: Strongly Correlated Electrons (cond-mat.str-el); Statistical Mechanics (cond-mat.stat-mech); Mathematical Physics (math-ph)
Cite as: arXiv:cond-mat/0404483 [cond-mat.str-el]
  (or arXiv:cond-mat/0404483v2 [cond-mat.str-el] for this version)
  https://doi.org/10.48550/arXiv.cond-mat/0404483
Journal reference: J. Statist. Phys. 118, 973-996 (2005)
Related DOI: https://doi.org/10.1007/s10955-004-2174-y

Submission history

From: Daniel Ueltschi [view email]
[v1] Wed, 21 Apr 2004 03:04:54 UTC (20 KB)
[v2] Wed, 10 Nov 2004 21:08:10 UTC (21 KB)
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