Ferroelectricity in perovskite HoMnO3 and YMnO3

被引：182
|
作者：
Lorenz, Bernd [1 ]
Wang, Ya-Qi
Chu, Ching-Wu
机构：
[1] Univ Houston, TCS, Dept Phys, Houston, TX 77204 USA
[2] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA
[3] Hong Kong Univ Sci & Technol, Hong Kong, Peoples R China
来源：
PHYSICAL REVIEW B | 2007年 / 76卷 / 10期
关键词：
D O I：
10.1103/PhysRevB.76.104405
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Ferroelectricity is observed in orthorhombic HoMnO3 and YMnO3 at the magnetic lock-in transitions into an E-type structure or an incommensurate phase with a temperature independent wave vector, respectively. In HoMnO3, the ferroelectric polarization strongly depends on the external magnetic field, indicating the involvement of the rare earth moment order in this compound. The results are discussed within the framework of recent theoretical models, in particular, the double exchange driven polar displacements predicted for E-type magnetic structures.
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页数：5
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