Anisotropic double exchange in orbitally degenerate mixed valence systems

J. J. Borras-Almenar, J. M. Clemente-Juan, E. Coronado, A. V. Palii, B. S. Tsukerblat

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18 Scopus citations

Abstract

The problem of the double exchange is considered for the mixed valence dimers in which one or both transition metal ions possess orbitally degenerate ground states. In the pseudo-angular momentum representation, the general formula is deduced for the matrix elements of double exchange involving the transfer integrals and all spin and orbital quantum numbers. The pairs 3T1 (t2/2)-2T2 (t2/1) and 3T1 (t2/2)-4A2 (t2/3) are considered in three high-symmetric topologies: edge-shared D(2h), corner-shared D(4h), and face-shared D(3h) bioctahedra. The double exchange in orbitally degenerate systems is shown to produce strong magnetic anisotropy of an orbital nature. The character of the anisotropy proved to be dependent on the overall symmetry of the system and on the ground terms of the metal ions. (C) 2000 Elsevier Science B.V.

Original languageEnglish
Pages (from-to)275-285
Number of pages11
JournalChemical Physics
Volume254
Issue number2-3
DOIs
StatePublished - 1 Apr 2000
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (all)
  • Physical and Theoretical Chemistry

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