Ultrafast dynamics in optimally doped YBa2Cu3O7-δ observed with white light pump-probe spectroscopy

Y. T. Wang*, Y. H. Lee, Y. J. Chen, W. T. Tang, Chih-Wei Luo, Atsushi Yabushita, Kaung-Hsiung Wu, Jiunn-Yuan Lin, Jenh-Yih Juang, T. M. Uen, T. Kobayashi

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The quasiparticle relaxation dynamics in optimally doped (001) YBa 2Cu 3O 7-δ thin films were measured at various temperatures by white light pump-probe technique. The 2D ultrafast spectroscopy with broadband (∼200 nm) and high time-resolution (∼9 fs) was performed by the non-collinear optical parametric amplifier (NOPA). The relaxation time and the amplitude of the transient transmissivity changes (ΔT/T) are wavelength-dependent. The maximum ΔT/T appears at around 625 nm (∼1.98 eV) which corresponds to the transition between the Fermi level and the UHB (upper Hubbard band). Furthermore, the oscillations with ∼150, ∼320, ∼500 cm -1 have been clearly observed in the Fourier transformed graph of the 2D ultrafast spectroscopy, which are consistent with the phonon modes in Raman-scattering spectra.

    Original languageEnglish
    Pages (from-to)519-521
    Number of pages3
    JournalJournal of Superconductivity and Novel Magnetism
    Volume24
    Issue number1-2
    DOIs
    StatePublished - Jan 2011

    Keywords

    • 2D ultrafast spectroscopy
    • Cuprate superconductors
    • YBa2Cu3O7-δ

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