Domains within Domains and Walls within Walls: Evidence for Polar Domains in Cryogenic SrTiO3

Salje, E. K. H. and Aktas, O. and Carpenter, M. A. and Laguta, V. V. and Scott, J. F. (2013) Domains within Domains and Walls within Walls: Evidence for Polar Domains in Cryogenic SrTiO3. Physical Review Letters, 111 (24). p. 247603. ISSN 0031-9007 ESSN: 1079-7114 DOI 10.1103/PhysRevLett.111.247603

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Abstract

Resonant piezoelectric spectroscopy shows polar resonances in paraelectric SrTiO3 at temperatures below 80 K. These resonances become strong at T<40  K. The resonances are induced by weak electric fields and lead to standing mechanical waves in the sample. This piezoelectric response does not exist in paraelastic SrTiO3 nor at temperatures just below the ferroelastic phase transition. The interpretation of the resonances is related to ferroelastic twin walls which become polar at low temperatures in close analogy with the known behavior of CaTiO3. SrTiO3 is different from CaTiO3, however, because the wall polarity is thermally induced; i.e., there exists a small temperature range well below the ferroelastic transition point at 105 K where polarity appears on cooling. As the walls are atomistically thin, this transition has the hallmarks of a two-dimensional phase transition restrained to the twin boundaries rather than a classic bulk phase transition.

Item Type:	Article
Uncontrolled Keywords:	2013AREP; IA67;
Subjects:	03 - Mineral Sciences
Divisions:	03 - Mineral Sciences
Journal or Publication Title:	Physical Review Letters
Volume:	111
Page Range:	p. 247603
Identification Number:	10.1103/PhysRevLett.111.247603
Depositing User:	Sarah Humbert
Date Deposited:	14 Feb 2014 17:27
Last Modified:	18 Feb 2014 17:31
URI:	http://eprints.esc.cam.ac.uk/id/eprint/2952

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