Mechanism of exchange striction of ferroelectricity in multiferroic orthorhombic HoMnO3 single crystals

被引：73
|
作者：
Lee, N. [1 ,2 ]
Choi, Y. J. [1 ,2 ]
Ramazanoglu, M. [1 ,2 ]
Ratcliff, W., II [3 ]
Kiryukhin, V. [1 ,2 ]
Cheong, S. -W. [1 ,2 ]
机构：
[1] Rutgers State Univ, Rutgers Ctr Emergent Mat, Piscataway, NJ 08854 USA
[2] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA
[3] NIST, NIST Ctr Neutron Res, Gaithersburg, MD 20899 USA
来源：
PHYSICAL REVIEW B | 2011年 / 84卷 / 02期
基金：
新加坡国家研究基金会;
关键词：
PEROVSKITE;
D O I：
10.1103/PhysRevB.84.020101
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
E-type perovskite magnet HoMnO3 is considered to be a prototype Mn-Mn exchange-striction driven multiferroic. We have grown orthorhombic HoMnO3 single crystals and studied the directional dependence of their electric polarization P. The direction of P is not along the crystallographic a axis, as predicted, but along the c axis. The magnetic state is incommensurate. The direction P along the c axis is primarily induced by Ho-Mn exchange striction, and Mn-Mn striction in the incommensurate spin state leads to an antiferroelectric order along the a axis. We predict the rotation of P with temperature in commensurate E-type RMnO3 (R denotes magnetic rare earth).
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页数：4
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