This article is cited in 3 papers

Proceedings of the XIX All-Russian Conference on Physics of Ferroelectrics (VKS-XIX) (Moscow, Russia, June 19-23, 2011

Central peak in the strontium titanate crystal near the tetragonal-to-cubic phase transition

V. K. Malinovskii, A. M. Pugachev, N. V. Surovtsev

Institute of Automation and Electrometry, Siberian Branch of Russian Academy of Sciences, Novosibirsk

Abstract: Raman spectra of the SrTiO$_3$ 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 $T_c$.

 English version: Physics of the Solid State, 2012, 54:5, 924–926

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