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Strain-controlled optical absorption in epitaxial ferroelectric BaTiO.sub.3./sub. films
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SYSNO ASEP 0449010 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Strain-controlled optical absorption in epitaxial ferroelectric BaTiO3 films Author(s) Chernova, Ekaterina (FZU-D)
Pacherová, Oliva (FZU-D) RID, ORCID
Chvostová, Dagmar (FZU-D) RID, SAI, ORCID
Dejneka, Alexandr (FZU-D) RID, ORCID
Kocourek, Tomáš (FZU-D) RID, ORCID, SAI
Jelínek, Miroslav (FZU-D) RID, ORCID
Tyunina, Marina (FZU-D) ORCIDSource Title Applied Physics Letters. - : AIP Publishing - ISSN 0003-6951
Roč. 106, č. 19 (2015), "192903-1"-"192903-4"Number of pages 4 s. Language eng - English Country US - United States Keywords thin-films ; polarization ; evolution ; SrTiO3 Subject RIV BM - Solid Matter Physics ; Magnetism R&D Projects GA15-13778S GA ČR - Czech Science Foundation (CSF) GA15-15123S GA ČR - Czech Science Foundation (CSF) Institutional support FZU-D - RVO:68378271 UT WOS 000355008100027 EID SCOPUS 84929379829 DOI 10.1063/1.4921083 Annotation A lattice strain of 0.3%-1.3% is achieved in epitaxial tetragonal BaTiO3 films grown on (001)-oriented SrTiO3 single-crystal substrates. Our experimental studies of absorption spectra in the range of 0.74-9.0 eV demonstrate that epitaxy produces significant changes in the optical properties of the films compared with those of a reference polydomain BaTiO3 crystal: the absorption edge and the peak at 5 eV strongly blue-shift by 0.2-0.4 eV, the magnitude of the peak at 5 eV drops, and certain spectral features disappear, whereas the absorption peak at 8.5 eV remains unchanged. The observed behavior is attributed to ferroelectric polarization, which is enhanced by epitaxial strain in the films. Our results indicate that epitaxially induced variations of ferroelectric polarization may be used to tailor the optical properties of thin films for photonic and optoelectronic applications. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2016
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