Switching the ferroelectric polarization in the S=1/2 chain cuprate LiCuVO4 by external magnetic fields

被引：106

作者：

Schrettle, F. ^{[1
]}

Krohns, S. ^{[1
]}

Lunkenheimer, P. ^{[1
]}

Hemberger, J. ^{[1
]}

Buttgen, Norbert ^{[1
]}

Von Nidda, H. -A. Krug ^{[1
]}

Prokofiev, A. V. ^{[2
]}

Loidl, A. ^{[1
]}

机构：

[1] Univ Augsburg, Ctr Elect Corrleat & Magnetism, D-86135 Augsburg, Germany

[2] Vienna Univ Technol, Inst Festkorperphys, A-1040 Vienna, Austria

来源：

PHYSICAL REVIEW B | 2008年 / 77卷 / 14期

关键词：

D O I：

10.1103/PhysRevB.77.144101

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present a detailed study of the complex dielectric constant and the ferroelectric polarization in multiferroic LiCuVO4 as function of temperature and external magnetic field. In zero external magnetic field, a spiral spin order with an ab helix and a propagation vector along the crystallographic b direction is established, which induces ferroelectric order with spontaneous polarization parallel to a. The direction of the helix can be reoriented by an external magnetic field and allows switching of the spontaneous polarization. We find a strong dependence of the absolute value of the polarization for different orientations of the spiral plane. Above 7.5 T, LiCuVO4 reveals collinear spin order and remains paraelectric for all field directions. Thus, this system is ideally suited to check the symmetry relations for spiral magnets as predicted theoretically. The strong coupling of ferroelectric and magnetic order is documented and the complex (H,T) phase diagram is fully explored.

引用

页数：6

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