期刊
NATURE COMMUNICATIONS
卷 5, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms5927
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资金
- JSPS KAKENHI [24244058, 24740235]
- Italian Ministry of Research through the project MIUR-PRIN
- [13J01596]
- Grants-in-Aid for Scientific Research [24740235, 13J01596] Funding Source: KAKEN
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 (< similar to 0.1 mu C cm(-2)) is much smaller than that in conventional ferroelectrics (typically several to several tens of mCcm(-2)). Here we show that the application of external pressure to a representative spin-driven ferroelectric, TbMnO3, causes a flop of P and leads to the highest P (approximate to 1.0 mu C cm(-2)) among spin-driven ferroelectrics ever reported. We explain this behaviour in terms of a pressureinduced 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 mu C cm(-2). This value is nearly an order of magnitude larger than those ever reported in spin-driven ferroelectrics.
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