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Photoinduced insulator-to-metal transition and coherent acoustic phonon propagation in LaCoO.sub.3./sub. thin films explored by femtosecond pump-probe ellipsometry
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SYSNO ASEP 0560857 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Photoinduced insulator-to-metal transition and coherent acoustic phonon propagation in LaCoO3 thin films explored by femtosecond pump-probe ellipsometry Author(s) Zahradník, Martin (FZU-D) ORCID
Kiaba, M. (CZ)
Espinoza Herrera, Shirly J. (FZU-D) ORCID
Rebarz, Mateusz (FZU-D) ORCID
Andreasson, Jakob (FZU-D) ORCID
Caha, O. (CZ)
Abadizaman, F. (CZ)
Munzar, D. (CZ)
Dubroka, A. (CZ)Number of authors 9 Article number 235113 Source Title Physical Review B. - : American Physical Society - ISSN 2469-9950
Roč. 105, č. 23 (2022)Number of pages 8 s. Language eng - English Country US - United States Keywords femtosecond pump-probe ellipsometry ; LaCoO3 thin films ; acustic strain pulse Subject RIV BF - Elementary Particles and High Energy Physics OECD category Particles and field physics R&D Projects LM2018110 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) EF15_003/0000447 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) EF16_019/0000789 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) LM2017094 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Open access Institutional support FZU-D - RVO:68378271 UT WOS 000823054900004 EID SCOPUS 85133655304 DOI 10.1103/PhysRevB.105.235113 Annotation We have studied ultrafast dynamics of thin films of LaCoO 3 and La 0.5 Sr 0.5 CoO 3 with femtosecond pump-probe ellipsometry in the energy range of 1.6–3.4 eV. We have observed a large pump-induced transfer of spectral weight in LaCoO 3 that corresponds to an insulator-to-metal transition. The photoinduced metallic state initially relaxes via a fast process with a decay constant of about 200 fs. Both LaCoO 3 and La 0.5 Sr 0.5 CoO 3 exhibit a significant secondary peak in the 1–30 ps range. Results of measurements on films with different thicknesses demonstrate that it corresponds to a propagation of an acoustic strain pulse. On timescales longer than 100 ps, heat diffusion to the substrate takes place that can be modeled with a biexponential decay. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2023 Electronic address https://hdl.handle.net/11104/0333641
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