Infrared phonon signatures of multiferroicity in TbMn2O5

被引：49

作者：

Aguilar, R. Valdes ^{[1
]}

Sushkov, A. B.

Park, S.

Cheong, S. -W.

Drew, H. D.

机构：

[1] Univ Maryland, Mat Res Sci & Engn Ctr, College Pk, MD 20742 USA

[2] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA

[3] Rutgers State Univ, Ctr Emergent Mat, Piscataway, NJ 08854 USA

来源：

PHYSICAL REVIEW B | 2006年 / 74卷 / 18期

关键词：

D O I：

10.1103/PhysRevB.74.184404

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The infrared (IR) active phonons in multiferroic TbMn2O5 are studied as a function of temperature. Most of the symmetry allowed IR modes polarized along the a and b crystal axes are observed and the behavior of several b polarized phonons is correlated with the magnetic and ferroelectric transitions. A high frequency b polarized phonon only Raman allowed in the paraelectric phase becomes IR active at the ferroelectric transition. The IR strength of this mode is proportional to the square of the ferroelectric order parameter and gives a sensitive measure of the symmetry lowering lattice distortions in the ferroelectric phase.

引用

页数：5

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