Pseudo-proper ferroelectricity and magnetoelectric effects in TbMnO3

被引：37

作者：

Toledano, Pierre ^{[1
]}

机构：

[1] Univ Picardie, Lab Phys Complex Syst, F-80000 Amiens, France

来源：

PHYSICAL REVIEW B | 2009年 / 79卷 / 09期

关键词：

antiferromagnetic materials; dielectric polarisation; ferroelectric transitions; ferroelectricity; magnetic structure; magnetoelectric effects; multiferroics; phase diagrams; terbium compounds;

D O I：

10.1103/PhysRevB.79.094416

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A unifying theoretical description of the magnetoelectric effects found in TbMnO3 is proposed. The phase diagrams at zero and applied magnetic fields are worked out. They reveal that the "giant" dielectric effects observed in the spiral phase of TbMnO3 result from an effective bilinear coupling of the polarization with the magnetic order parameter. This property applies to a number of multiferroic materials, in which the electric polarization is induced by a spiral magnetic structure. The spiral phase is shown to become unstable above definite threshold fields, giving rise to the observed polarization flops and triggering the onset of a commensurate ferroelectric phase.

引用

页数：4

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