Light Scattering Study in SrTiO^sub 3^ Under Uniaxial Pressure

A 180° Brillouin scattering experiment has been performed in order to clarify the dynamical mechanism of the transition from the quantum paraelectric state to the quantum ferroelectric state under [010]c uniaxial pressure in SrTiO3. A quasi-transverse acoustic mode appears above critical pressures σ...

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Bibliographic Details
Published in:Ferroelectrics 2012-01, Vol.430 (1), p.50
Main Authors: Tsujimi, Yuhji, Minami, Hidetoshi, Uwe, Hiromoto
Format: Article
Language:English
Subjects:
Crystal structure
Ferroelectrics
Pressure
Quantum theory
Scattering
Online Access:Get full text
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Summary:A 180° Brillouin scattering experiment has been performed in order to clarify the dynamical mechanism of the transition from the quantum paraelectric state to the quantum ferroelectric state under [010]c uniaxial pressure in SrTiO3. A quasi-transverse acoustic mode appears above critical pressures σc ~ 33 kg/mm^2 (at T = 27.5 K) and σc = 7~10 kg/mm^2 (at T = 10.3 K). This appearance indicates that a spontaneous polarization is not parallel to any of cubic axes in the quantum ferroelectric state and that the condensation of the ferroelectric A 1(x) mode originated from the Slater E u(x, y) mode is not the dynamical mechanism of the transition. [PUBLICATION ABSTRACT]
ISSN:0015-0193
1563-5112