Magnetoelectric properties of LiCoPO4 and LiNiPO4

被引：130

作者：

Kornev, I

Bichurin, M

Rivera, JP

Gentil, S

Schmid, H

Jansen, AGM

Wyder, P

机构：

[1] Novgorod State Univ, Dept Engn Phys, Novgorod 173003, Russia

[2] Univ Geneva, Dept Inorgan Analyt & Appl Chem, CH-1211 Geneva 4, Switzerland

[3] Max Planck Inst Festkorperforsch, Grenoble High Magnet Field Lab, F-38042 Grenoble 9, France

[4] CNRS, F-38042 Grenoble 9, France

来源：

PHYSICAL REVIEW B | 2000年 / 62卷 / 18期

关键词：

D O I：

10.1103/PhysRevB.62.12247

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In strong magnetic fields up to 20 T quasistatic measurements of the magnetic-field-induced electric polarization have been performed in LiNiPO4 single crystals between 4.2 and similar to 25 K. The magnetoelectric (ME) effect has been studied in detail near the Neel temperature. The temperature hysteresis of the polarization induced by a magnetic field was found. An anomalous temperature dependence of the magnetoelectric susceptibility during the phase transition and the ME "butterfly loop" were observed. The phenomenological theory of the magnetoelectric effect in LiCoPO4 and LiNiPO4 has been developed. A tentative explanation of the existence of the magnetoelectric "butterfly loop" is given. It is shown that there is a non-lifshitz invariant in the free energy expansion which is linear in the spatial derivatives. Hence the phase transition to a space-modulated spin structure is possible. The influence of such a structure on the linear magnetoelectric effect is examined.

引用

页码：12247 / 12253

页数：7

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