Ferroelectricity Induced by Spin-Dependent Metal-Ligand Hybridization in Ba2CoGe2O7

被引：190

作者：

Murakawa, H. ^{[1
]}

Onose, Y. ^{[1
]}

Miyahara, S. ^{[1
]}

Furukawa, N. ^{[1
,2
]}

Tokura, Y. ^{[1
,3
,4
]}

机构：

[1] Univ Tokyo, Multiferro Project, ERATO, Japan Sci & Technol Agcy,Dept Appl Phys, Tokyo 1138656, Japan

[2] Aoyama Gakuin Univ, Dept Math & Phys, Kanagawa 2298558, Japan

[3] RIKEN ASI, Cross Correlated Mat Res Grp, Wako, Saitama 3510198, Japan

[4] RIKEN ASI, CERG, Wako, Saitama 3510198, Japan

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 105卷 / 13期

关键词：

MULTIFERROICS;

D O I：

10.1103/PhysRevLett.105.137202

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have investigated the variation of induced ferroelectric polarization under a magnetic field with various directions and magnitudes in a staggered antiferromagnet Ba2CoGe2O7. While the ferroelectric polarization cannot be explained by the well-accepted spin current model nor the exchange striction mechanism, we have shown that it is induced by the spin-dependent p-d hybridization between the transition metal (Co) and ligand (O) via the spin-orbit interaction. On the basis of the correspondence between the direction of electric polarization and the magnetic state, we have also demonstrated the electrical control of the magnetization direction.

引用

页数：4

共 23 条

[1] Gigantic magnetoelectric effect caused by magnetic-field-induced canted antiferromagnetic-paramagnetic transition in quasi-two-dimensional Ca2CoSi2O7 crystal [J].