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Dynamics of mesoscopic polarization in the uniaxial tetragonal tungsten bronze (Sr.sub.x./sub.Bai.sub.1-x./sub.)Nb.sub.2./sub.O.sub.6./sub.
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SYSNO ASEP 0517757 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Dynamics of mesoscopic polarization in the uniaxial tetragonal tungsten bronze (SrxBai1-x)Nb2O6 Author(s) Buixaderas, Elena (FZU-D) RID, ORCID
Kempa, Martin (FZU-D) RID, ORCID
Svirskas, Š. (LT)
Kadlec, Christelle (FZU-D) RID, ORCID
Bovtun, Viktor (FZU-D) RID, ORCID, SAI
Savinov, Maxim (FZU-D) RID, ORCID
Pasciak, Marek (FZU-D) ORCID
Dec, J. (PL)Number of authors 8 Article number 184113 Source Title Physical Review B. - : American Physical Society - ISSN 2469-9950
Roč. 100, č. 18 (2019), s. 1-11Number of pages 11 s. Publication form Print - P Language eng - English Country US - United States Keywords tetragonal tungsten-bronzes ; polarization ; dielectric response ; relaxors Subject RIV BM - Solid Matter Physics ; Magnetism OECD category Condensed matter physics (including formerly solid state physics, supercond.) R&D Projects GA16-09142S GA ČR - Czech Science Foundation (CSF) EF16_019/0000760 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Limited access Institutional support FZU-D - RVO:68378271 UT WOS 000498849400001 EID SCOPUS 85076364064 DOI 10.1103/PhysRevB.100.184113 Annotation The high-frequency dielectric behaviour of uniaxial tungsten-bronze strontium barium niobate crystals with various Sr/Ba ratios, including both ferroelectric and relaxor compositions, have been studied in a broad frequency range (10^4 to 10^13 Hz) and temperature interval 100–500 K in order to thoroughly understand the evolution of the relaxation dynamics across the ferroelectric phase transition. The dielectric response along the polar axis consists of three relaxations corresponding to polarization mechanisms related to several correlation lengths of mesoscopic order. All of them show dissimilar behaviors with temperature, pointing out to their distinct nature. A temperature dependent central mode at THz frequencies and a relaxation above 10 GHz are accompanied by the slowing down of a relaxation in the MHz range. This response reveals the complex mechanism of the phase transition and supports the coexistence of displacive and order-disorder scenarios.
Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2020 Electronic address https://doi.org/10.1103/physrevb.100.184113
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