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Small-polaron conductivity in perovskite ferroelectric BaTiO.sub.3./sub. films
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SYSNO ASEP 0566635 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Small-polaron conductivity in perovskite ferroelectric BaTiO3 films Author(s) Tyunina, Marina (FZU-D) ORCID
Savinov, Maxim (FZU-D) RID, ORCID
Dejneka, Alexandr (FZU-D) RID, ORCIDNumber of authors 3 Article number 202901 Source Title Applied Physics Letters. - : AIP Publishing - ISSN 0003-6951
Roč. 121, č. 20 (2022)Number of pages 5 s. Language eng - English Country US - United States Keywords electron polarons ; excitons Subject RIV BM - Solid Matter Physics ; Magnetism OECD category Condensed matter physics (including formerly solid state physics, supercond.) R&D Projects EF16_019/0000760 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) GA22-10832S GA ČR - Czech Science Foundation (CSF) Method of publishing Limited access Institutional support FZU-D - RVO:68378271 UT WOS 000886646400003 EID SCOPUS 85143979996 DOI 10.1063/5.0129831 Annotation Small-polaron hopping conductivity was evidenced and examined in various pulsed-laser-deposited films of ferroelectric BaTiO3 and reference films of SrTiO3. For this, AC conductivity was studied in a broad range of temperatures and frequencies for films sandwiched between the bottom and top electrodes. In the BaTiO3 films, with increasing temperature, a significant increase in activation energy for small-polaron hopping was found and ascribed to strong electron–phonon coupling and complex lattice oscillations therein. Plain relations of the activation energy to microstructure, composition, or phase transitions were lacking, which corroborated the critical role of phonons. Additionally, a phonon-less transport was detected. It was anticipated that owing to strong electron–phonon coupling, rich phonon ensembles, and coexistence of phonon-stimulated and phonon-less processes, the small-polaron conductivity can heavily vary in ferroelectric films that necessitates further studies. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2023 Electronic address https://doi.org/10.1063/5.0129831
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