Raman Scattering on the Effective Soft Mode for Lithium Niobate Crystals

The evolution of Raman spectra in a wide range of temperatures that includes the ferroelectric transition point in lithium niobate single crystals is studied for polarization geometry X ( ZZ ) Y . In this geometry, the soft mode responsible for the phase transition distinguished by 1 A 1 (TO)-type s...

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Bibliographic Details
Published in:Bulletin of the Russian Academy of Sciences. Physics 2018-03, Vol.82 (3), p.299-303
Main Authors: Gorelik, V. S., Pyatyshev, A. Yu
Format: Article
Language:English
Subjects:
Crystals
Ferroelectric materials
Ferroelectricity
Hadrons
Heavy Ions
Lithium niobates
Nuclear Physics
Opalescence
Phase transitions
Physics
Physics and Astronomy
Raman spectra
Single crystals
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Summary:The evolution of Raman spectra in a wide range of temperatures that includes the ferroelectric transition point in lithium niobate single crystals is studied for polarization geometry X ( ZZ ) Y . In this geometry, the soft mode responsible for the phase transition distinguished by 1 A 1 (TO)-type symmetry should appear in the spectra. Experimental studies show that the 1 A 1 (TO) mode interacts resonantly with nonfundamental modes in the low-frequency region of the spectrum. Near the ferroelectric phase transition point, an isofrequency opalescence effect is observed that consists of an abrupt increase in Raman signal intensity at fixed frequencies near the excitation line.
ISSN:1062-8738
1934-9432
DOI:10.3103/S1062873818030097