Orbital liquid in perovskite transition-metal oxides

S. Ishihara, M. Yamanaka, N. Nagaosa

Research output: Contribution to journalArticlepeer-review

186 Citations (Scopus)

Abstract

We study the effects of the degeneracy of the (Formula presented) orbitals in perovskite transition-metal oxides in the limit of strong repulsive electron-electron interaction. The isospin field is introduced to describe the orbital degrees of freedom and is represented by the boson with a constraint. The dispersion of this boson is flat along (Formula presented): lattice constant) and the other two equivalent directions. This enables the orbital disordered phase down to low temperatures. Some of the anomalous experiments in the low-temperature ferromagnetic phase of La(Formula presented)Sr(Formula presented)MnO(Formula presented) are interpreted in terms of this orbital liquid picture. The coupling between the orbital degrees of freedom and the Jahn-Teller lattice distortion and its implications to the optical conductivity are also discussed.

Original languageEnglish
Pages (from-to)686-692
Number of pages7
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume56
Issue number2
DOIs
Publication statusPublished - 1997
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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