Abstract
Raman spectra of the SrTiO3 crystal have been measured in wide temperature (22–316 K) and frequency (2–1020 cm−1) ranges. It has been shown that a central peak appears in low-frequency Raman spectra at temperatures above 70 K. In the spectral geometry with polarization rotation near the temperature T c = 106 K of the cubic-to-tetragonal phase transition, the central peak exhibits properties of the order-disorder phase transition. Such a behavior of the central peak has been explained by the interaction of the low-frequency soft mode E g with the relaxation mode near T c .
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Original Russian Text © V.K. Malinovskii, A.M. Pugachev, N.V. Surovtsev, 2012, published in Fizika Tverdogo Tela, 2012, Vol. 54, No. 5, pp. 871–873.
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Malinovskii, V.K., Pugachev, A.M. & Surovtsev, N.V. Central peak in the strontium titanate crystal near the tetragonal-to-cubic phase transition. Phys. Solid State 54, 924–926 (2012). https://doi.org/10.1134/S1063783412050265
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DOI: https://doi.org/10.1134/S1063783412050265