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Femtosecond relaxation dynamics of electronic processes and electron-phonon coupling in YBa2Cu3O7-δ and PrBa2Cu3O7 epitaxial films

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Zeitschrift für Physik B Condensed Matter

Abstract

The room temperature femtosecond relaxation dynamics of reflection spectra of YBa2Cu3O7-δ with different oxygen contents and PrBa2Cu3O7 epitaxial films have been studied. The relaxation times of ΔR(t) in YBa2Cu3O7-δ increase from less than 100 fs to more than 1 ps with increasing δ and with substitution of Pr for Y. The electron and lattice temperature profiles at these quasi-equilibrium state are calculated from the nonequilibrium energy-balance model. The process of electronphonon energy transfer was found to be dominated in our experiments. These results reveal that in 123 phase superconductors decrease of carrier concentration slows down the carrier-phonon coupling and the type of the electron-phonon interaction would be localized. The dependence of electron-phonon coupling to oxygen defects in YBa2Cu3O7-δ was found to be λ∼exp(−δ).

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Author notes

  1. Wen-Sheng Zeng

    Present address: Max-Planck-Institut für Festkörperforschung, D-70569, Stuttgart, Germany

Authors and Affiliations

  1. Department of Physics, Zhongshan (Sun Yat-Sen) University, 510275, Guangzhou, People's Republic of China

    Wen-Sheng Zeng, Wei-Zhu Lin, Dang Mo & F. P. Pi

  2. Department of Physics, National Laboratory for Artificial Micro structure and Mesoscopic Physics, Beijing University, 100871, Beijing, People's Republic of China

    Zhong-Ji Xia, Yin-Hua Zhou & Guang-Cheng Xiong

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Zeng, WS., Lin, WZ., Mo, D. et al. Femtosecond relaxation dynamics of electronic processes and electron-phonon coupling in YBa2Cu3O7-δ and PrBa2Cu3O7 epitaxial films. Z. Physik B - Condensed Matter 96, 5–12 (1994). https://doi.org/10.1007/BF01313009

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  • DOI: https://doi.org/10.1007/BF01313009

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