Magnetodielectric coupling of infrared phonons in single-crystal Cu2OSeO3

Authors

K. H. Miller, University of Florida
X. S. Xu, University of Nebraska-LincolnFollow
H. Berger, Ecole Polytechnique Federal de Lausanne
E. S. Knowles, University of Florida
D. J. Arenas, University of Florida
M. W. Meisel, University of Florida
D. B. Tanner, University of Florida

Date of this Version

2010

Document Type

Article

Citation

PHYSICAL REVIEW B 82, 144107 (2010)

Comments

Used by permission.

Abstract

Reflection and transmission as a function of temperature (5–300 K) have been measured on a single crystal of the magnetoelectric ferrimagnetic compound Cu₂OSeO₃ utilizing light spanning the far infrared to the visible portions of the electromagnetic spectrum. The complex dielectric function and optical properties were obtained via Kramers-Kronig analysis and by fits to a Drude-Lortentz model. The fits of the infrared phonons show a magnetodielectric effect near the transition temperature (T_c~60 K). Assignments to strong far-infrared phonon modes have been made, especially those exhibiting anomalous behavior around the transition temperature.