Electronic ferroelectricity and frustration

Sumio Ishihara

Research output: Contribution to journalArticlepeer-review

90 Citations (Scopus)

Abstract

Beyond a conventional classification of ferroelectricity, there is a class of materials where electronic degrees of freedom and electronic interactions are directly responsible for electric polarization and ferroelectric transition. This is termed electronic ferroelectricity. In this article, we review electronic ferroelectricity from a view point of frustration. Experimental and theoretical examinations in spin driven ferroelectric materials, recently termed multiferroics, are introduced. Spin frustration caused by competing magnetic interactions is of prime importance for this type of ferroelectricity. Charge driven ferroelectricity where electronic charge order induces electric polarization is reviewed. In particular, exotic dielectric and magneto-dielectric properties in layered iron oxides are focused on. Through a number of recent experimental and theoretical researches, charge fluctuation due to frustrated geometry plays essential roles on electronic ferroelectricity in this compound.

Original languageEnglish
Article number011010
Journaljournal of the physical society of japan
Volume79
Issue number1
DOIs
Publication statusPublished - 2010 Jan

Keywords

  • Charge order
  • Ferroelectricity
  • Frustration
  • Multiferroics

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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