Interplay of Spin and Orbital Orderings in Perovskite Manganites

Wataru Koshibae, Yuhki Kawamura, Satoshi Okamoto, Jun Ichiro Inoue, Sadamichi Maekawa, Sumio Ishihara, Sadamichi Maekawa

Research output: Contribution to journalArticlepeer-review

53 Citations (Scopus)


We present an exact diagonalization study for perovskite manganites using an effective Hamiltonian which includes a coupling between the spin and orbital degrees of freedom derived from a strong on-site Coulomb interaction and orbital degeneracy of Mn ions. We investigate spin and orbital orderings as well as their excitations for the undoped insulating and the doped charge-ordered phases using three-dimensional 2×2×2 clusters to maintain proper symmetry of the systems. It is shown that the anisotropic magnetic structures, such as A-type antiferromagnetic ordering, are realized by self-adjustment of the orbital ordering where the orbital degeneracy is lifted by spins, indicating a strong interplay of spins and orbitals.

Original languageEnglish
Pages (from-to)957-960
Number of pages4
Journaljournal of the physical society of japan
Issue number4
Publication statusPublished - 1997
Externally publishedYes


  • Mn oxides
  • exact diagonalization
  • orbital ordering
  • strongly correlated electron systems

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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