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Ferromagnetic instability in the two-band Hubbard model

Authors
Journal
Solid State Communications
0038-1098
Publisher
Elsevier
Publication Date
Volume
27
Issue
9
Identifiers
DOI: 10.1016/0038-1098(78)90209-0
Disciplines
  • Chemistry
  • Physics

Abstract

Abstract A discussion is given of a general method of evaluating the ferromagnetic susceptibility which takes into account the variation of the chemical potentials when the spin-symmetry is broken. For the single-band Hubbard model the absence of an instability in CPA is confirmed, while for the two-band case in the strong-coupling limit the expression yields a critical electron density for a ferromagnetic transition in a semi-elliptic band.

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