Systematics of electromagnons in the spiral spin-ordered states of RMnO3

被引：34
|
作者：
Lee, J. S. [1 ]
Kida, N. [1 ]
Miyahara, S. [1 ]
Takahashi, Y. [1 ,2 ]
Yamasaki, Y.
Shimano, R. [1 ,3 ]
Furukawa, N. [1 ,4 ]
Tokura, Y. [1 ,2 ,5 ]
机构：
[1] Univ Tokyo, Dept Appl Phys, Exploratory Res Adv Technol ERATO, Japan Sci & Technol Agcy JST, Tokyo 1138656, Japan
[2] Univ Tokyo, Dept Appl Phys, Tokyo 1138656, Japan
[3] Univ Tokyo, Dept Phys, Tokyo 1130033, Japan
[4] Aoyama Gakuin Univ, Dept Math & Phys, Kanagawa 2298558, Japan
[5] RIKEN, Cross Correlated Mat Res Grp CMRG, ASI, Wako, Saitama 3510198, Japan
来源：
PHYSICAL REVIEW B | 2009年 / 79卷 / 18期
关键词：
dysprosium compounds; exchange interactions (electron); gadolinium compounds; magnons; multiferroics; terbium compounds;
D O I：
10.1103/PhysRevB.79.180403
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Electromagnon, magnetic excitation driven by an electric field of light, has been investigated for a series of perovskite manganites RMnO3. Two distinct excitations commonly appear in the spiral spin-ordered state, and systematic changes in their peak positions and spectral weights were observed as a function of the radius of the R-ion or equivalently of spin-exchange interaction energies. By comparing the results with the spin-wave calculation based on the Heisenberg model, the higher-lying excitation is assigned to the zone-edge magnon. The strong electric-dipole activity of these magnetic excitations is discussed in terms of dynamic coupling among the collective modes.
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页数：4
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