Effect of a non-magnetic atom in double-exchange ferromagnets

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3 Citations (Scopus)

Abstract

Using the exact diagonalization technique for a finite-size cluster, we have studied the effect of a non-magnetic atom on the magnetism of the double-exchange ferromagnet constituted of the Hubbard model and localized spin system. The non-magnetic atom raises the critical correlation energy Uc for the full spin polarization, but spreads a partial spin polarization region below Uc. This is caused by the effect that a double occupation of electrons, realized at the non-magnetic atom, reduces the total spin but stabilizes the ferromagnetic phase with the help of kinetic-energy gain of the conduction electrons. Based on the present results, we discuss the ferromagnetism of some Mn or Fe alloys containing non-magnetic elements such as B, C, N, Al, Si, etc.

Original languageEnglish
Pages (from-to)173-178
Number of pages6
JournalJournal of Magnetism and Magnetic Materials
Volume173
Issue number1-2
DOIs
Publication statusPublished - 1997 Sep 1
Externally publishedYes

Keywords

  • Double-exchange interaction
  • Exact diagonalization
  • Ferromagnetism
  • Iron nitrides

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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