Anisotropic ultrafast dynamics of quasiparticles on CuO2 planes of Y0.7 Ca0.3 Ba2 Cu3 O7-δ

Chih-Wei Luo*, T. C. Huang, M. T. Chiang, Kaung-Hsiung Wu, Jenh-Yih Juang, Jiunn-Yuan Lin, T. M. Uen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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The orientation-resolved femtosecond spectroscopy, combined with the well-textured (110)- and (001)-Y 0.7 Ca 0.3 Ba 2 Cu 3 O 7-δ thin films, serves as an effective probe to quasiparticle relaxation dynamics on the ab planes and along the diagonal orientations. The significant divergences in the temperature-dependent relaxation time (τ) associated with the opening of superconducting gap were observed along the nodal directions and on the CuO 2 planes which are dominated by the a axis and b axis in the over-doped region. Moreover, the divergence in the temperature-dependent τ along the nodal direction disappears around optimal doped region. This implies that the superconducting gap evolves from the dominant s-wave symmetry in over-doped region into the dominant d-wave symmetry in optimal doped region.

Original languageAmerican English
Pages (from-to)781-784
Number of pages4
JournalJournal of Superconductivity and Novel Magnetism
Issue number5
StatePublished - 1 Jul 2010


  • Anisotropic ultrafast dynamics
  • Cuprate superconductors
  • Superconducting gap symmetry


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