Magnetic Field Induced Dehybridization of the Electromagnons in Multiferroic TbMnO3

被引：23

作者：

Rovillain, P. ^{[1
]}

Cazayous, M. ^{[1
]}

Gallais, Y. ^{[1
]}

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

Sacuto, A. ^{[1
]}

Sakata, H. ^{[2
]}

Mochizuki, M. ^{[3
]}

机构：

[1] Univ Paris 07, Lab Mat & Phenomenes Quant, CNRS, UMR 7162, F-75205 Paris 13, France

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

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

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 107卷 / 01期

关键词：

TERBIUM ALUMINUM GARNET; CRYSTAL-FIELD; ION;

D O I：

10.1103/PhysRevLett.107.027202

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have studied the impact of the magnetic field on the electromagnon excitations in TbMnO3 crystal. Applying a magnetic field along the c axis, we show that the electromagnons transform into pure antiferromagnetic modes, losing their polar character. Entering in the paraelectric phase, we are able to track the spectral weight transfer from the electromagnons to the magnon excitations and we discuss the magnetic excitations underlying the electromagnons. We also point out the phonons involved in the phase transition process. This reveals that the Mn-O distance plays a key role in understanding the ferroelectricity and the polar character of the electromagnons. Magnetic field measurements along the b axis allow us to detect a new electromagnon resonance in agreement with a Heisenberg model.

引用

页数：4

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