Magnetically driven ferroelectric atomic displacements in orthorhombic YMnO3

D. Okuyama, S. Ishiwata, Y. Takahashi, K. Yamauchi, S. Picozzi, K. Sugimoto, H. Sakai, M. Takata, R. Shimano, Y. Taguchi, T. Arima, Y. Tokura

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63 Citations (Scopus)

Abstract

Magnetically driven ferroelectric atomic displacements of the order of 10-3 Å have been observed in orthorhombic (perovskite like) YMnO3 by a single-crystal synchrotron x-ray diffraction. The refined polar structure shows the characteristic bond alternation driven by the exchange striction in staggered Mn-O-Mn arrays with ↑↑↓↓ type ordering, giving rise to a spontaneous polarization along the a axis. First-principles calculations based on the Berry phase method as well as on the experimentally refined crystal structure can reproduce the observed polarization value.

Original languageEnglish
Article number054440
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume84
Issue number5
DOIs
Publication statusPublished - 2011 Aug 11
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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