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

被引：77

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).

引用

页数：4

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