Magnetic inversion symmetry breaking and ferroelectricity in TbMnO3 -: art. no. 087206

被引：770

作者：

Kenzelmann, M ^{[1
]}

Harris, AB

Jonas, S

Broholm, C

Schefer, J

Kim, SB

Zhang, CL

Cheong, SW

Vajk, OP

Lynn, JW

机构：

[1] ETH Honggerberg, Solid State Phys Lab, CH-8093 Zurich, Switzerland

[2] ETH, Neutron Scattering Lab, CH-5232 Villigen, Switzerland

[3] Paul Scherrer Inst, CH-5232 Villigen, Switzerland

[4] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA

[5] Univ Penn, Dept Phys & Astron, Philadelphia, PA 19104 USA

[6] Natl Inst Stand & Technol, Ctrt Neutron Res, Gaithersburg, MD 20899 USA

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

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 95卷 / 08期

关键词：

D O I：

10.1103/PhysRevLett.95.087206

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

TbMnO3 is an orthorhombic insulator where incommensurate spin order for temperature T-N< 41 K is accompanied by ferroelectric order for T < 28 K. To understand this, we establish the magnetic structure above and below the ferroelectric transition using neutron diffraction. In the paraelectric phase, the spin structure is incommensurate and longitudinally modulated. In the ferroelectric phase, however, there is a transverse incommensurate spiral. We show that the spiral breaks spatial inversion symmetry and can account for magnetoelectricity in TbMnO3.

引用

页数：4

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