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

被引：32
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.
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页数：4
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