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Open AccessArticle

Symmetry of the Optical Phonons in LuVO4: A Raman Study

1
Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee Blvd., 1784 Sofia, Bulgaria
2
Institute of Optical Materials and Technologies, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., 109, 1113 Sofia, Bulgaria
3
Department of Electrophysics, National Chiao Tung University, 1001 Ta Hsueh Road, Hsinchu 30010, Taiwan
4
Department of Applied Chemistry, National Chiao Tung University, 1001 Ta Hsueh Road, Hsinchu 30010, Taiwan
*
Author to whom correspondence should be addressed.
Crystals 2020, 10(5), 341; https://doi.org/10.3390/cryst10050341
Received: 21 March 2020 / Revised: 20 April 2020 / Accepted: 21 April 2020 / Published: 26 April 2020
(This article belongs to the Special Issue Rare-Earths-Doped Materials)
A thorough analysis of the first-order vibrational spectrum of LuVO4 is presented by using polarized micro-Raman spectroscopy with special focus on the phonon modes with the weakest intensity and occasional controversial assignment. Group-theory analysis is carried out to demonstrate the determination of numbers and symmetries of the Raman active modes. Crystal- and correlation-field splitting effects in the vibrational spectrum of LuVO4 are discussed. Under conditions adjusted to minimize the birefringence effects we recorded, in each main scattering configuration, a series of Raman spectra in different sample orientations achieved by rotating the sample around the incident laser beam. The dependence of the Raman intensity on the rotational angle allowed us to identify the correct symmetry of the phonons with exceptionally weak scattering cross-section. A complete assignment of all twelve first-order Raman active phonons of LuVO4 is thus obtained. View Full-Text
Keywords: rare-earth orthovanadates; single crystal; LuVO4; Raman spectroscopy; optical phonons rare-earth orthovanadates; single crystal; LuVO4; Raman spectroscopy; optical phonons
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Rafailov, P.; Dimitrov, D.; Chen, Y.-F.; Lee, C.-S.; Juang, J.-Y. Symmetry of the Optical Phonons in LuVO4: A Raman Study. Crystals 2020, 10, 341.

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