Magnetoelectric excitations in multiferroic TbMnO3 by Raman scattering

被引：37

作者：

Rovillain, P. ^{[1
]}

Cazayous, M. ^{[1
]}

Gallais, Y. ^{[1
]}

Sacuto, A. ^{[1
]}

Measson, M-A. ^{[1
]}

Sakata, H. ^{[2
]}

机构：

[1] Univ Paris Diderot Paris 7, Lab Mat & Phenomenes Quant, UMR 7162, CNRS, F-75205 Paris 13, France

[2] Tokyo Univ Sci, Dept Phys, Shinjyuku Ku, Tokyo 1628601, Japan

来源：

PHYSICAL REVIEW B | 2010年 / 81卷 / 05期

关键词：

TERBIUM ALUMINUM GARNET; ELECTRONIC EXCITATIONS; CRYSTAL-FIELD; ION;

D O I：

10.1103/PhysRevB.81.054428

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Low-energy excitations in the multiferroic material TbMnO3 have been investigated by Raman spectroscopy. Our observations reveal the existence of two peaks at 30 and 60 cm(-1). They are observed in the cycloidal phase below the Curie temperature but not in the sinusoidal phase, suggesting their magnetoelectric origin. While the peak energies coincide with the frequencies of electromagnons measured previously by transmission spectroscopy, they show surprisingly different selection rules, with the 30 cm(-1) excitation enhanced by the electric field of light along the spontaneous polarization. The origins of the two modes are discussed under Raman and infrared selection rules considerations.

引用

页数：5

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