期刊
PHYSICAL REVIEW B
卷 84, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.84.054440
关键词
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资金
- European Community [203523]
- JSPS
- MEXT, Japan [19052001, 20046017]
- Grants-in-Aid for Scientific Research [20046017, 19052001] Funding Source: KAKEN
Magnetically driven ferroelectric atomic displacements of the order of 10(-3) angstrom 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 up arrow up arrow down arrow down arrow 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.
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