Infrared phonon modes in multiferroic single-crystal FeTe2O5Br

Autor:	Cliff G. Martin, Helmuth Berger, David B. Tanner, K. H. Miller, Xiaoxiang Xi, Xiaoshan Xu, V. Craciun, G. L. Carr
Rok vydání:	2013
Předmět:	Materials science Condensed matter physics Far infrared Infrared Phonon Lattice (order) Condensed Matter::Strongly Correlated Electrons Multiferroics Condensed Matter Physics Anisotropy Single crystal Electronic Optical and Magnetic Materials Monoclinic crystal system
Zdroj:	Physical Review B. 87
ISSN:	1550-235X 1098-0121
DOI:	10.1103/physrevb.87.224108
Popis:	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 FeTe2O5Br 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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::fa972fc0e4ecc1bc4ee6e0b1e7b86371 https://doi.org/10.1103/physrevb.87.224108 Zobrazit plný text záznamu