Domains within domains and walls within walls: Evidence for polar domains in cryogenic SrTiO.sub.3./sub..

0424317 - FZÚ 2014 RIV US eng J - Journal Article
Salje, E.K.H. - Aktas, O. - Carpenter, M.A. - Laguta, Valentyn - Scott, J.F.
Domains within domains and walls within walls: Evidence for polar domains in cryogenic SrTiO₃.
Physical Review Letters. Roč. 111, č. 24 (2013), "247603-1"-"247603-5". ISSN 0031-9007. E-ISSN 1079-7114
Institutional support: RVO:68378271
Keywords : ferroelectric domains * SrTiO₃ * phase transition
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 7.728, year: 2013

Resonant piezoelectric spectroscopy shows polar resonances in paraelectric SrTiO3 at temperatures below 80 K. The resonances are induced by weak electric fields and lead to standing mechanical waves in the sample. 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. 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.
Permanent Link: http://hdl.handle.net/11104/0230394