Role of orbitals in manganese oxides-ordering and fluctuation

R. Maezono, S. Murakami, N. Nagaosa, S. Ishihara, M. Yamanaka, H. C. Lee

研究成果: Conference article査読


We study the manganese oxides from the viewpoint of the strongly correlated doped Mott insulator. The magnetic ordering and the charge transport are governed by the orbital degrees of freedom, and their dimensionality is controlled by the anisotropic transfer integrals between the eg-orbitals. As x increases, the magnetic structure is predicted to change as A→F→A→C→G (F, ferromagnet; A, layered antiferromagnet; C, rod-type antiferromagnet; G, usual antiferromagnet), in agreement with experiments. Especially the orbital is aligned as dx2-y2 in the metallic A state, which explains the quasi 2D transport and no canting of the spin observed experimentally. Next we discuss the ferromagnetic state without the orbital ordering due to the quantum fluctuation. Here the interplay between the electron repulsion U and the Jahn-Teller electron-phonon interaction ELR is studied with a large d model. In addition to this strong correlation, we propose that the dynamical phase separation could explain the specific heat as well as the various anomalous physical properties, e.g. resistivity, photo-emission, etc.

ジャーナルMaterials Science and Engineering B: Solid-State Materials for Advanced Technology
出版ステータスPublished - 1999 8 16
イベントProceedings of the 1998 7th NEC Symposium on Fundamental Approaches to New Material Phases: Phase Control in Spin-Charge-Orbital Complex Systems - Nasu, Japan
継続期間: 1998 10 111998 10 15

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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