Electronic Ferroelectricity and Frustration

DOI DOI Web Site 被引用文献51件 参考文献101件 オープンアクセス
  • Sumio Ishihara
    Department of Physics, Tohoku University, Sendai 980-8578, Japan

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説明

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.

13 pages, 13 figures, to be published in J. Phys. Sco. Jpn. Special Topics "Novel States of Matter Induced by Frustration"

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