Electric polarization, magnetoelectric effect, and orbital state of a layered iron oxide with frustrated geometry

A. Nagano, Makoto Naka, J. Nasu, S. Ishihara

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A layered iron oxide RFe2O4 (R denotes rare-earth-metal elements) is an exotic dielectric material with charge-order (CO) driven electric polarization and magnetoelectric effect caused by spin-charge coupling. In this paper, a theory of electronic structure and dielectric property in RFe2O4 is presented. Charge frustration in paired-triangular lattices allows a charge imbalance without inversion symmetry. Spin frustration induces reinforcement of this polar CO by a magnetic ordering. We also analyze an orbital model for the Fe ion which does not show a conventional long-range order.

Original languageEnglish
Article number217202
JournalPhysical Review Letters
Issue number21
Publication statusPublished - 2007 Nov 19
Externally publishedYes


ASJC Scopus subject areas

  • Physics and Astronomy(all)

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