Interplay of Mott transition and ferromagnetism in the orbitally degenerate Hubbard model

Raymond Frésard, Gabriel Kotliar

Research output: Contribution to journalArticlepeer-review

134 Scopus citations

Abstract

A slave-boson representation for the degenerate Hubbard model is introduced. The location of the metal-to-insulator transition that occurs at commensurate densities is shown to depend weakly on the band degeneracy (Formula presented). The relative weights of the Hubbard subbands depend strongly on (Formula presented), as well as the magnetic properties. It is also shown that a sizable Hund’s rule coupling is required in order to have a ferromagnetic instability appearing. The metal-to-insulator transition driven by an increase in temperature is a strong function of it.

Original languageEnglish (US)
Pages (from-to)12909-12915
Number of pages7
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume56
Issue number20
DOIs
StatePublished - 1997

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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