Year: 2013
Type: article
Abstract: Reflection and transmission as a function of temperature (7--300 K and 5--300 K respectively) have been measured on single crystals of the multiferroic compound FeTe${}_{2}$O${}_{5}$Br utilizing light spanning from the far infrared to the visible. The complex dielectric function and other optical properties were obtained via Kramers-Kronig analysis and by fits to a Drude-Lortentz model. Analysis of the anisotropic excitation spectra via Drude-Lorentz fitting and lattice dynamical calculations have led to the observation of 43 of the 53 modes predicted along the $b$ axis of the monoclinic cell. The phonon response parallel to the $a$ and $c$ axes are also presented. Assignments to groups (clusters) of phonons have been made and trends within them are discussed in light of our calculated displacement patterns.
Source: Physical Review B
Authors: K. H. Miller, X. S. Xu, H. Berger, V. Craciun, Xiaoxiang Xi, C. Martin, G. L. Carr, D. B. Tanner
Language: English
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
Funder: U.S. Department of Energy
OpenAlex ID: W2003305409