Mechanism of Lattice-Distortion-Induced Electric-Polarization Flop in the Multiferroic Perovskite Manganites

被引：36

作者：

Mochizuki, Masahito ^{[1
]}

Furukawa, Nobuo ^{[2
]}

机构：

[1] Univ Tokyo, Dept Appl Phys, Japan Sci & Technol Agcy JST, ERATO,Multiferro Project,Bunkyo Ku, Tokyo 1138656, Japan

[2] Aoyama Gakuin Univ, Dept Math & Phys, Kanagawa 2298558, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2009年 / 78卷 / 05期

关键词：

multiferroics; Mn perovskite; phase diagram; Dzyaloshinskii-Moriya interaction;

D O I：

10.1143/JPSJ.78.053704

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We theoretically study a competition between two types of spin cycloids (ab-plane and bc-plane ones) in the multiferroic perovskite manganites, which is an origin of intriguing tnagnetoelectric phenomena in these compounds. Analysis of a microscopic model using the Monte-Carlo method reveals that their competition originates from a conflict between the single-ion anisotropy and the Dzyaloshinsky-Moriya interaction. It is demonstrated that the conflict can be controlled by tuning the second-neighbor spin exchanges through the GdFeO3-type distortion, which leads to a cycloidal-plane flop from ab to be observed in the solid-solution systems like Eu1-xYxMnO3 and Gd1-xTbxMnO3 with increasing x.

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页数：4

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