Dilution effects on orbital order in strongly correlated electron systems

S. Ishihara, T. Tanaka, M. Matsumoto

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Dilution effects in orbital ordered systems with strong electron correlation are studied theoretically. Vacancy-concentration x dependence of the orbital-ordering temperature TOO calculated in the two-representative orbital models, i.e. the eg-orbital model in a three dimensional square lattice and the two-dimensional orbital compass model. Reduction of TOO as a function of x is stronger than that in dilute magnets and is not explained by the simple percolation theory. This phenomenon is attributed to the directional interaction between orbitals. It is shown that due to the quantum effects, the effective dimensionality in the system is increased and the orbital order becomes robust against dilution. The present calculation provides a new aspect of the dilute ordered state in strongly correlated electron systems.

Original languageEnglish
Pages (from-to)216-219
Number of pages4
JournalJournal of Molecular Structure
Volume838
Issue number1-3
DOIs
Publication statusPublished - 2007 Jul 16

Keywords

  • Dilution
  • Electron correlation
  • Orbital degree of freedom

ASJC Scopus subject areas

  • Analytical Chemistry
  • Spectroscopy
  • Organic Chemistry
  • Inorganic Chemistry

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