Strain-Gradient-Induced Polarization in SrTiO3 Single Crystals

Zubko, P. and Catalan, G. and Buckley, A. and Welche, P. R. L. and Scott, J. F. (2007) Strain-Gradient-Induced Polarization in SrTiO3 Single Crystals. Physical Review Letters, 99 (16). p. 167601. DOI 10.1103/PhysRevLett.99.167601

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Abstract

Piezoelectricity is inherent only in noncentrosymmetric materials, but a piezoelectric response can also be obtained in centrosymmetric crystals if subjected to inhomogeneous deformation. This phenomenon, known as flexoelectricity, can significantly affect the functional properties of insulators, particularly thin films of high permittivity materials. We have measured strain-gradient-induced polarization in single crystals of paraelectric SrTiO3 as a function of temperature and orientation down to and below the 105 K phase transition. Estimates were obtained for all the components of the flexoelectric tensor, and calculations based on these indicate that local polarization around defects in SrTiO3 may exceed the largest ferroelectric polarizations. A sign reversal of the flexoelectric response detected below the phase transition suggests that the ferroelastic domain walls of SrTiO3 may be polar.

Item Type:	Article
Uncontrolled Keywords:	2007 AREP IA55 2007 P
Subjects:	03 - Mineral Sciences
Divisions:	03 - Mineral Sciences
Journal or Publication Title:	Physical Review Letters
Volume:	99
Page Range:	p. 167601
Identification Number:	10.1103/PhysRevLett.99.167601
Depositing User:	Sarah Humbert
Date Deposited:	16 Feb 2009 13:04
Last Modified:	23 Jul 2013 09:54
URI:	http://eprints.esc.cam.ac.uk/id/eprint/843

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