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Phase transitions in ferroelectric Pb.sub.0.5./sub.Sr.sub.0.5./sub.TiO.sub.3./sub. films probed by spectroscopic ellipsometry
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SYSNO ASEP 0386395 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Phase transitions in ferroelectric Pb0.5Sr0.5TiO3 films probed by spectroscopic ellipsometry Author(s) Tyunina, Marina (FZU-D) ORCID
Dejneka, Alexandr (FZU-D) RID, ORCID
Chvostová, Dagmar (FZU-D) RID, SAI, ORCID
Levoska, J. (FI)
Plekh, M. (FI)
Jastrabík, Lubomír (FZU-D) RID, ORCIDSource Title Physical Review B - ISSN 1098-0121
Roč. 86, č. 22 (2012), "224105-1"-"224105-6"Number of pages 6 s. Language eng - English Country US - United States Keywords Pb0.5Sr0.5TiO3 fthin films ; spectroscopic ellipsometry ; phase transitions Subject RIV BM - Solid Matter Physics ; Magnetism R&D Projects TA01010517 GA TA ČR - Technology Agency of the Czech Republic (TA ČR) GAP108/12/1941 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z10100522 - FZU-D (2005-2011) UT WOS 000312023600002 DOI https://doi.org/10.1103/PhysRevB.86.224105 Annotation Phase transitions occurring in Pb0.5Sr0.5TiO3 films are experimentally studied by combining spectroscopic ellipsometry and low-frequency dielectric analysis. Polycrystalline and polydomain epitaxial films with relaxedmisfit strain and columnarmicrostructure are investigated. The paraelectric and the ferroelectric states, and the temperatures and widths of the paraelectric-to-ferroelectric phase transitions, are identified from the temperature evolution of refractive index measured in transparency range. The temperatures at which transitions start on cooling are found to be considerably higher than the temperatures of the dielectric peaks. In contrast to the broad dielectric peaks, the transition width of 60 K in the polycrystalline film and that of 20 K in the polydomain epitaxial film are revealed. The discrepancies between optical and dielectric data are explained by the influence of extrinsic factors on the low-frequency response. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2015
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