Spin and orbital orderings and their excitations in perovskite Mn oxides

J. Inoue, S. Ishihara, W. Koshibae, Y. Kawamura, S. Okamoto, S. Maekawa

Research output: Contribution to journalArticlepeer-review


An effective Hamiltonian, which includes a coupling between spins and orbitals, is derived for manganites by taking into account the Hund coupling, on-site Coulomb interaction and orbital degeneracy of the eg state. By using the effective Hamiltonian, magnetic structures, spin and orbital excitations are studied in a mean field approximation for the undoped insulating phase and in the exact diagonalization method for the undoped and 50 % doped charge-ordered phases. It is shown that the coupling between spins and orbitals is crucial to the magnetic structures and that the so-called A-type AF is realized by self-adjusting the orbital ordering. Implication to the colossal magnetoresistance in manganites is given.

Original languageEnglish
Pages (from-to)3225-3231
Number of pages7
JournalCzechoslovak Journal of Physics
Issue numberSUPPL. 6
Publication statusPublished - 1996 Dec 1
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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