Spin-lattice coupling in ferroelectric spiral magnets:: Comparison between the cases of (Tb,Dy)MnO3 and CoCr2O4

被引：33

作者：

Arima, Taka-hisa ^{[1
]}

Yamasaki, Yuichi

Goto, Takeshi

Iguchi, Satoshi

Ohgushi, Kenya

Miyasaka, Shigeki

Tokura, Yoshinori

机构：

[1] Tohoku Univ, Inst Multidisciplinary Res Adv Mat, Sendai, Miyagi 9808577, Japan

[2] Japan Sci & Technol Agcy, Spin Superstruct Project, ERATO, Tsukuba, Ibaraki 3058562, Japan

[3] Univ Tokyo, Dept Appl Phys, Tokyo 1138656, Japan

[4] Japan Sci & Technol Agcy, ERATO, Multiferro Project, Tsukuba, Ibaraki 3058562, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2007年 / 76卷 / 02期

关键词：

multiferroics; perovskite manganese oxide; spinel cobalt oxide; spiral magnet; cycloid; conical magnet; exchange striction; superlattice; synchrotron x-ray diffraction;

D O I：

10.1143/JPSJ.76.023602

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Lattice modulation expected for various types of spiral magnetic ordering with a propagation vector Q(m) is discussed in terms of the symmetric ((SiSj)-S-. type) and antisymmetric (S-i x S-j type) exchange interactions between neighboring spins (S-i and S-j). We show that the conical ordering causes the superlattice modulation with Q(m) via the antisymetric interaction, while the elliptical deformation of spiral induces a 2Q(m) modulation in lattice, due to the symmetric and antisymmetric interactions. This theoretical prediction was experimentally confirmed for a transverse elliptical antiferromagnet (Tb,Dy)MnO3 and a transverse conical ferrimagnet CoCr2O4, both accompanied by ferroelectricity (lattice deformation with Q = 0) as well.

引用

页数：4

共 24 条

[1] NEW APPROACH TO THE THEORY OF SUPEREXCHANGE INTERACTIONS [J].