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

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

Research output: Contribution to journalArticle

94 Citations (Scopus)

Abstract

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
Volume99
Issue number21
DOIs
Publication statusPublished - 2007 Nov 19
Externally publishedYes

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frustration
iron oxides
orbitals
polarization
geometry
reinforcement
dielectric properties
rare earth elements
inversions
electronic structure
symmetry
metals
ions

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Electric polarization, magnetoelectric effect, and orbital state of a layered iron oxide with frustrated geometry. / Nagano, A.; Naka, Makoto; Nasu, J.; Ishihara, S.

In: Physical Review Letters, Vol. 99, No. 21, 217202, 19.11.2007.

Research output: Contribution to journalArticle

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