Multiferroicity in the square-lattice antiferromagnet of Ba2CoGe2O7

被引：65

作者：

Yi, H. T. ^{[2
,3
]}

Choi, Y. J. ^{[2
,3
]}

Lee, S. ^{[2
,3
]}

Cheong, S. -W. ^{[1
,2
,3
]}

机构：

[1] Rutgers State Univ, Dept Elect & Comp Engn, Piscataway, NJ 08854 USA

[2] Rutgers State Univ, Rutgers Ctr Emergent Mat, Piscataway, NJ 08854 USA

[3] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA

来源：

APPLIED PHYSICS LETTERS | 2008年 / 92卷 / 21期

关键词：

D O I：

10.1063/1.2937110

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have discovered the appearance of ferroelectricity below the Neel temperature of 6.7 K in the antiferromagnetic Ba2CoGe2O7 with square magnetic lattice. The ferroelectric polarization is rather small in magnitude and aligned along the c axis, but its magnitude increases remarkably and its direction rotates away smoothly from the c axis when magnetic fields are applied along the c axis. The electric polarization's behavior of smooth rotation, rather than a sudden flip, is unique. It also accompanies a linear increase in magnetization and a smooth change of dielectric constant with little hysteresis, which may be important for certain technological applications. (c) 2008 American Institute of Physics.

引用

页数：3

共 16 条

[1] Collinear to spiral spin transformation without changing the modulation wavelength upon ferroelectric transition in Tb1-xDyxMnO3 [J].