Hyper-Raman and Raman scattering from the polar modes of PbMg1 3Nb2 3O3

Microhyper-Raman spectroscopy of PbMg1 3Nb2 3O3 (PMN) single crystal is performed at room temperature. The use of an optical microscope working in backscattering geometry significantly reduces the LO signal, highlighting thereby the weak contributions underneath. We clearly identify the highest freq...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2014-01, Vol.26 (1), p.015401-015401
Main Authors: Hehlen, B, Amouri, A, Al-Zein, A, Khemakhem, H
Format: Article
Language:English
Subjects:
Condensed Matter
Disordered Systems and Neural Networks
hyper-Raman
Lead - chemistry
Magnesium - chemistry
Niobium - chemistry
Oxygen - chemistry
Physics
Raman
relaxor
Scattering, Radiation
Spectrophotometry, Infrared
Spectrum Analysis, Raman
Vibration
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Summary:Microhyper-Raman spectroscopy of PbMg1 3Nb2 3O3 (PMN) single crystal is performed at room temperature. The use of an optical microscope working in backscattering geometry significantly reduces the LO signal, highlighting thereby the weak contributions underneath. We clearly identify the highest frequency transverse optic mode (TO3) in addition to the previously observed soft TO-doublet at low frequency and TO2 at intermediate frequency. TO3 exhibits strong inhomogeneous broadening but perfectly fulfils the hyper-Raman cubic selection rules. The analysis shows that hyper-Raman spectroscopy is sensitive to all the vibrations of the average cubic symmetry group of PMN, the three polar F1u- and the silent F2u-symmetry modes. All these vibrations can be identified in the Raman spectra alongside other vibrational bands likely arising from symmetry breaking in polar nanoregions.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/26/1/015401