Theory of spin-charge-orbital states in the frustrated system RFe 2O4

Sumio Ishihara, Makoto Naka, Aya Nagano

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Electronic structure in multiferroic compound RFe2O4 is studied theoretically. We suggest that orbital degree of freedom in a Fe 2+ ion is active. The effective Hamiltonian for spin, charge and orbital degrees of freedom is derived. Numerical analyses with the multi-canonical Monte-Carlo simulation show that the electric polarization is attributed to the charge order with momentum (1/3,1/3). A magnitude of the polarization is enhanced around the magnetic ordering temperature due to the coupling between spin and charge. Conventional orbital order is not expected from the numerical calculation. We discuss possible orbital state at low temperatures.

Original languageEnglish
Title of host publicationFerroelectrics and Multiferroics
Number of pages6
Publication statusPublished - 2006 Dec 1
Event2006 MRS Fall Meeting - Boston, MA, United States
Duration: 2006 Nov 272006 Nov 29

Publication series

NameMaterials Research Society Symposium Proceedings
ISSN (Print)0272-9172


Other2006 MRS Fall Meeting
Country/TerritoryUnited States
CityBoston, MA

ASJC Scopus subject areas

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


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