Giant spin-driven ferroelectric polarization in TbMnO3 under high pressure

T. Aoyama, K. Yamauchi, A. Iyama, S. Picozzi, K. Shimizu, T. Kimura

研究成果: Article査読

108 被引用数 (Scopus)

抄録

The recent research on multiferroics has provided solid evidence that the breaking of inversion symmetry by spin order can induce ferroelectric polarization P. This type of multiferroics, called spin-driven ferroelectrics, often show a gigantic change in P on application of a magnetic field B. However, their polarization (<∼0.1 μC cm -2) is much smaller than that in conventional ferroelectrics (typically several to several tens of μC cm -2). Here we show that the application of external pressure to a representative spin-driven ferroelectric, TbMnO 3, causes a flop of P and leads to the highest P (≈1.0 μC cm -2) among spin-driven ferroelectrics ever reported. We explain this behaviour in terms of a pressure-induced magnetoelectric phase transition, based on the results of density functional simulations. In the high-pressure phase, the application of B further enhances P over 1.8 μC cm -2. This value is nearly an order of magnitude larger than those ever reported in spin-driven ferroelectrics.

本文言語English
論文番号4927
ジャーナルNature communications
5
DOI
出版ステータスPublished - 2014
外部発表はい

ASJC Scopus subject areas

  • 化学 (全般)
  • 生化学、遺伝学、分子生物学(全般)
  • 一般
  • 物理学および天文学(全般)

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