Model calculations for the study of direct and superexchange interactions

D. E. Ellis, Arthur J Freeman

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


Investigations of the two-atom M2+-M2+ and the three-atom M2+-(F-)-M2+ systems have been made in order to study both direct and superexchange mechanisms. In these model calculations all electrons are treated explicitly within the framework of the unrestricted Hartree-Fock procedure; the Fock matrix is evaluated directly by Monte Carlo integration techniques. The effective exchange parameter J is determined at several internuclear distances, and spin densities are exhibited for the ferromagnetic and anti-ferromagnetic states of the three-atom system. The AF state lies lower in energy beyond a calculated critical bond length. Localization of the uhf eigenfunctions and the significance of the Mott transition for magnetic ordering are discussed.

Original languageEnglish
Pages (from-to)424-426
Number of pages3
JournalJournal of Applied Physics
Issue number2
Publication statusPublished - 1968

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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