Pressure-Induced Multiferroics via Pseudo Jahn-Teller Effects and Novel Couplings
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- 作者：Changsong Xu ; Yang Li ; Bin Xu ; Jorge Í ; ñ ; iguez ; Wenhui Duan and Laurent Bellaiche
- 刊名：Advanced Functional Materials
- 出版年：2017
- 出版时间：January 19, 2017
- 年：2017
- 卷：27
- 期：3
- 全文大小：1324K
- ISSN：1616-3028
文摘
Multiferroic materials are currently attracting a lot of interest because of the cross-coupling between their electrical and magnetic properties, which has the potential to lead to novel devices. There is a relatively small number of multiferroics and, hence, various strategies have been proposed to design materials possessing both ordered electric and magnetic dipoles. However, one strategy that has been scarcely investigated so far is the application of hydrostatic pressure because such external factor has the tendency to suppress, rather than enhance or create, electrical polarization. Here, first-principles calculations are used to demonstrate that hydrostatic pressure can, in fact, stabilize a novel polar and magnetic – and thus multiferroic – phase; the occurrence of such a phase seems very general, as it is found in many presently investigated RMnO3 compounds, where R is a rare-earth ion. The predicted structure features original pseudo Jahn–Teller effects that induce a spontaneous electrical polarization via a previously unknown structural coupling of a rather convenient form. Such a discovery opens a new route to create multiferroics and tunable electronic devices.