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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

  1. 1.
    SYSNO ASEP0560857
    Document TypeJ - Journal Article
    R&D Document TypeJournal Article
    Subsidiary JČlánek ve WOS
    TitlePhotoinduced 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 authors9
    Article number235113
    Source TitlePhysical Review B. - : American Physical Society - ISSN 2469-9950
    Roč. 105, č. 23 (2022)
    Number of pages8 s.
    Languageeng - English
    CountryUS - United States
    Keywordsfemtosecond pump-probe ellipsometry ; LaCoO3 thin films ; acustic strain pulse
    Subject RIVBF - Elementary Particles and High Energy Physics
    OECD categoryParticles and field physics
    R&D ProjectsLM2018110 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 publishingOpen access
    Institutional supportFZU-D - RVO:68378271
    UT WOS000823054900004
    EID SCOPUS85133655304
    DOI10.1103/PhysRevB.105.235113
    AnnotationWe 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.
    WorkplaceInstitute of Physics
    ContactKristina Potocká, potocka@fzu.cz, Tel.: 220 318 579
    Year of Publishing2023
    Electronic addresshttps://hdl.handle.net/11104/0333641
Number of the records: 1  

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