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

Sumio Ishihara, Makoto Naka, Aya Nagano

研究成果: Conference contribution

抄録

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.

本文言語English
ホスト出版物のタイトルFerroelectrics and Multiferroics
ページ116-121
ページ数6
出版ステータスPublished - 2006 12 1
外部発表はい
イベント2006 MRS Fall Meeting - Boston, MA, United States
継続期間: 2006 11 272006 11 30

出版物シリーズ

名前Materials Research Society Symposium Proceedings
966
ISSN(印刷版)0272-9172

Other

Other2006 MRS Fall Meeting
CountryUnited States
CityBoston, MA
Period06/11/2706/11/30

ASJC Scopus subject areas

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

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