Anomalous Increase in Spectral Intensity of Soft-Mode Raman Scattering near the Temperature of the Ferroelectric Phase Transition in Lithium Tantalate Crystals

Reported are the results of studying the sharp increase in the spectral intensity at the lattice soft mode near the temperature of the phase transition in the lithium tantalate crystal. The Raman scattering spectra are recorded in the x ( zz ) y polarization geometry corresponding to manifestation o...

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Bibliographic Details
Published in:Physics of wave phenomena 2020-07, Vol.28 (3), p.241-249
Main Authors: Gorelik, V. S., Pyatyshev, A. Yu
Format: Article
Language:English
Subjects:
Acoustics
Crystals
Ferroelectric materials
Ferroelectricity
Frequency shift
Lithium tantalates
Phase Transitions
Physics
Physics and Astronomy
Quantum Optics
Quartz crystals
Raman spectra
Temperature
Temperature dependence
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Summary:Reported are the results of studying the sharp increase in the spectral intensity at the lattice soft mode near the temperature of the phase transition in the lithium tantalate crystal. The Raman scattering spectra are recorded in the x ( zz ) y polarization geometry corresponding to manifestation of the soft mode responsible for the ferroelectric phase transition in lithium tantalate at 898 K. The recording is performed at fixed temperatures T ( , T = const) and at fixed spectrometer frequencies ( , ) under slow (1 deg./min) crystal temperature variation. Strong increase (by three orders of magnitude) is observed in the peak of the reduced spectral intensity i 0 (Ω) of the isofrequency temperature dependence at the fixed spectrometer frequency shift relative to the exciting radiation cm –1 similar to the one earlier observed in quartz crystals.
ISSN:1541-308X
1934-807X
DOI:10.3103/S1541308X20030085