Elastic and Anelastic Properties of Ferroelectric SrTi^{18}O_{3} in the kHz-MHz Regime

Scott, J. F. and Bryson, J. and Carpenter, M. A. and Herrero-Albillos, J. and Itoh, M. (2011) Elastic and Anelastic Properties of Ferroelectric SrTi^{18}O_{3} in the kHz-MHz Regime. Physical Review Letters, 106 (10). p. 105502. DOI 10.1103/PhysRevLett.106.105502

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Abstract

Resonant ultrasound spectroscopy has been used to follow elastic softening in SrTi18O3 in the frequency range ∼0.2–1 MHz. A dramatic softening of C44 occurs as the Curie temperature Tc=24 K is approached from above or below, which correlates with the development of a central peak in Raman and Brillouin spectra. This is attributed to strong coupling between the acoustic mode and the central peak mode. A weaker anomaly is seen in a resonance mode which is believed to be controlled by 1/2(C11-C12). Significant attenuation accompanies this softening and an additional dissipation peak has also been observed at ∼80–90 K. This extends earlier work by a factor of 150 000× from the 30 GHz regime and helps address the question as to whether the ferroelectricity is stimulated primarily by a soft mode into a homogeneous ground state or by clustering of rhombohedral nanoregions into an inhomogeneous ground state.

Item Type: Article
Uncontrolled Keywords: 2010AREP; IA62; Part III
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
06 - Part-III Projects
Journal or Publication Title: Physical Review Letters
Volume: 106
Page Range: p. 105502
Identification Number: 10.1103/PhysRevLett.106.105502
Depositing User: Sarah Humbert
Date Deposited: 25 Mar 2011 16:43
Last Modified: 30 Oct 2014 11:18
URI: http://eprints.esc.cam.ac.uk/id/eprint/2038

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