Electric field tuning of hard polar phonons in strained SrTiO.sub.3./sub. films

0352348 - FZÚ 2011 RIV US eng J - Journal Article
Skoromets, Volodymyr - Kadlec, Christelle - Kužel, Petr - Kamba, Stanislav - Schubert, J.
Electric field tuning of hard polar phonons in strained SrTiO₃ films.
Journal of Applied Physics. Roč. 107, č. 12 (2010), 124116/1-124116/4. ISSN 0021-8979. E-ISSN 1089-7550
R&D Projects: GA AV ČR(CZ) IAA100100907; GA ČR(CZ) GA202/09/0682
Institutional research plan: CEZ:AV0Z10100520
Keywords : phonons * ferroelectricity * SrTiO₃
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 2.064, year: 2010

We investigate 100 nm thick epitaxial monolayer of SrTiO3 strained by 1% in biaxial tension and grown on (110) DyScO3. Spectra within the whole far-infrared spectral range are obtained as a function of temperature and an electric bias. An appreciable tunability of high frequency polar phonons is observed upon bias. The splitting of TO4 mode clearly observed below 220 K, which is further increased upon bias, is a signature of the ferroelectricity of the film at these temperatures.
Permanent Link: http://hdl.handle.net/11104/0191873