Colossal magnon-phonon coupling in multiferroic Eu0.75Y0.25MnO3

被引：77

作者：

Aguilar, R. Valdes ^{[1
]}

Sushkov, A. B.

Zhang, C. L.

Choi, Y. J.

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, Rutgers Ctr Emergent Mat, Piscataway, NJ 08854 USA

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

来源：

PHYSICAL REVIEW B | 2007年 / 76卷 / 06期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevB.76.060404

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report the spectra of magnetically induced electric dipole absorption in Eu0.75Y0.25MnO3 from temperature-dependent far-infrared spectroscopy (10-250 cm(-1)). These spectra, which occur only in the e parallel to a polarization, consist of two relatively narrow electromagnon features with onset at T-FE=30 K and a broad absorption band that persists to temperatures well above T-N=47 K. The observed excitations account for the step up of the static dielectric constant in the ferroelectric phase. The electromagnon at 80 cm(-1) is observed to be strongly coupled to the nearby lowest optical phonon which transfers more than 1/2 of its spectral weight to the magnon. We attribute the origin of the broad background absorption to the two-magnon-emission decay process of the phonon.

引用

页数：4

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