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
Externally publishedYes
Event2006 MRS Fall Meeting - Boston, MA
Duration: 2006 Nov 272006 Dec 1


Other2006 MRS Fall Meeting
CityBoston, MA


ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

Cite this

Ishihara, S., Naka, M., & Nagano, A. (2006). Theory of spin-charge-orbital states in the frustrated system RFe 2O4. In Ferroelectrics and Multiferroics (Vol. 966, pp. 116-121)