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

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

Research output: Contribution to journalArticle

95 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

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'Electric polarization, magnetoelectric effect, and orbital state of a layered iron oxide with frustrated geometry'. Together they form a unique fingerprint.

  • Cite this