Micro-Raman and infrared studies of multiferroic TbMn2O5

被引：13
|
作者：
Mansouri, S. [1 ]
Jandl, S. [1 ]
Roberge, B. [1 ]
Balli, M. [1 ]
Dimitrov, D. Z. [2 ]
Orlita, M. [3 ]
Faugeras, C. [3 ]
机构：
[1] Univ Sherbrooke, Dept Phys, 2500 Blvd Univ, Sherbrooke, PQ J1K 2R1, Canada
[2] Bulgarian Acad Sci, Inst Opt Mat & Technol, BU-1113 Sofia, Bulgaria
[3] Grenoble High Magnet Field Lab, 25 Ave Martyrs,Boite Postale 166, F-38042 Grenoble, France
来源：
JOURNAL OF PHYSICS-CONDENSED MATTER | 2016年 / 28卷 / 05期
关键词：
multiferroics; Raman spectroscopy; infrared spectroscopy; magnetization curve;
D O I：
10.1088/0953-8984/28/5/055901
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
We have studied the Raman and infrared spectral response of TbMn2O5 under an applied magnetic field parallel to the easy magnetic a-axis at 4.2 K. Strong spin-lattice coupling in TbMn2O5 is evidenced by a frequency shift of Raman and infrared phonons as a function of magnetic field compared to the phonon response of BiMn2O5 that remains unaffected. The magnetic field behavior of the highest frequency phonons retraces the polarization switching in TbMn2O5 and shows an important frequency softening below 3 T that is modulated by the J(3) and J(4) exchange parameters. The role of the Tb3+ spin alignment with H is interpreted in terms of a local lattice striction and the contribution of the charge transfer mechanism to the magnetoelectric process is evaluated.
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收藏
页数：6
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