Central peak in the strontium titanate crystal near the tetragonal-to-cubic phase transition |
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| Authors: | V K Malinovskii A M Pugachev N V Surovtsev |
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| Institution: | 1. Institute of Automation and Electrometry, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 1, Novosibirsk, 630090, Russia
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| Abstract: | Raman spectra of the SrTiO3 crystal have been measured in wide temperature (22?C316 K) and frequency (2?C1020 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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