Identifying the spectroscopic modes of multiferroic BiFeO3

被引：28

作者：

Fishman, Randy S. ^{[1
]}

Furukawa, Nobuo ^{[2
]}

Haraldsen, Jason T. ^{[3
,4
]}

Matsuda, Masaaki ^{[5
]}

Miyahara, Shin ^{[6
]}

机构：

[1] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA

[2] Aoyama Gakuin Univ, Dept Math & Phys, Sagamihara, Kanagawa 2298558, Japan

[3] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA

[4] Los Alamos Natl Lab, Ctr Integrated Nanotechnol, Los Alamos, NM 87545 USA

[5] Oak Ridge Natl Lab, Quantum Condensed Matter Div, Oak Ridge, TN 37831 USA

[6] Pohang Univ Sci & Technol, Asia Pacific Ctr Theoret Phys, Pohang 790784, Gyeongbuk, South Korea

来源：

PHYSICAL REVIEW B | 2012年 / 86卷 / 22期

关键词：

D O I：

10.1103/PhysRevB.86.220402

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have identified the modes of multiferroic BiFeO3 measured by THz and Raman spectroscopies. Excellent agreement with the observed peaks is obtained by including the effects of easy-axis anisotropy along the direction of the electric polarization. By distorting the cycloidal spin state, anisotropy splits the Psi(perpendicular to 1) mode into peaks at 20 and 21.5 cm(-1) and activates the lower Phi(+/- 2) mode at 27 cm(-1) (T = 200 K). An electromagnon is identified with the upper Psi(+/- 1) mode at 21.5 cm(-1). Our results also explain recent inelastic neutron-scattering measurements. DOI:10.1103/PhysRevB.86.220402

引用

页数：5