https://doi.org/10.1140/epjb/e2006-00206-x
Far-infrared optical properties of YVO4 single crystal
1
National Laboratory for Superconductivity, Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing, 100080, P.R. China
2
Department of Physics, Wuhan University, Wuhan, Hubei, 430072, P.R. China
Corresponding author: a xgqiu@aphy.iphy.ac.cn
Received:
21
December
2005
Revised:
10
February
2006
Published online:
1
June
2006
Near-normal incident infrared reflectivity spectra of a (001) YVO4 single crystal have been measured at different temperatures in the frequency region between 100 and 6000 cm-1. The reflectivity spectra are analyzed with the factorized form of the dielectric function, and the dielectric properties and optical conductivity of the YVO4 crystal are obtained. From the TO/LO splitting, effective charges at different temperatures are calculated to study the ionicity of YVO4. The internal modes of the VO43- ion and the external modes of the Y(VO4) lattice are compared with SiO44- in zircon and with other rare-earth vanadates.
PACS: 77.22.Ch – Permittivity (dielectric function) / 78.20.-e – Optical properties of bulk materials and thin films / 63.20.-e – Phonons in crystal lattices
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2006