Coexistence of weak ferromagnetism and ferroelectricity in the high pressure LiNbO3-type phase of FeTiO3.
Coexistence of weak ferromagnetism and ferroelectricity in the high pressure LiNbO3-type phase of FeTiO3.
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DOI：
10.1103/physrevlett.103.047601
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发表时间：
2009-05
影响因子：
8.6
通讯作者：
T. Varga;A. Kumar;E. Vlahos;S. Denev;M. Park;S. Hong;T. Sanehira;Y. Wang;C. Fennie;S. St
中科院分区：
文献类型：
--
作者：
T. Varga;A. Kumar;E. Vlahos;S. Denev;M. Park;S. Hong;T. Sanehira;Y. Wang;C. Fennie;S. St
本文报道了高压合成的多晶FeTiO_{3}的磁性和电学特性，该多晶FeTiO_{3}与非中心LiNbO_{3} （LBO）是同结构的。压电响应力显微镜，光学二次谐波产生和磁强计显示在室温及以下的铁电性和约120 K以下的弱铁磁性。这些结果验证了在LBO结构中结晶的一系列过渡金属钛酸盐中铁电性和弱铁磁性共存的对称性准则和第一性原理计算。
We report the magnetic and electrical characteristics of polycrystalline FeTiO_{3} synthesized at high pressure that is isostructural with acentric LiNbO_{3} (LBO). Piezoresponse force microscopy, optical second harmonic generation, and magnetometry demonstrate ferroelectricity at and below room temperature and weak ferromagnetism below approximately 120 K. These results validate symmetry-based criteria and first-principles calculations of the coexistence of ferroelectricity and weak ferromagnetism in a series of transition metal titanates crystallizing in the LBO structure.