Electron-boson coupling constant of oxygen-deficient Y0.7Ca0.3Ba2Cu3O7-δ measured by ultrafast spectroscopy

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The ultrafast dynamics in an (001) oxygen-deficient Y 0.7Ca 0.3Ba 2Cu 3O 7-δ thin film were measured by using the ultrafast spectroscopy. According to the model of time-dependent distributions of electrons in the case of electron-phonon relaxation, the electron-boson coupling constant λ could be directly obtained from the relaxation time of the transient reflectivity change (ΔR/R). For the overdoped case with T c = 61.3 K and the underdoped case with T c = 65.5 K, the relaxation time of ΔR/R is around 4.32 ps and 3.66 ps, respectively, which correspond to λ ∼ 0.06. However, the λ become larger (∼0.15) in the optimal doped region with T c = 82.1 K while the relaxation time of ΔR/R shrinks to ∼1.51 ps. These results indicate that the λ is strongly hole-doping dependent, which may govern the T c of cuprate superconductors.

Original languageEnglish
Pages (from-to)189-191
Number of pages3
JournalJournal of Superconductivity and Novel Magnetism
Issue number1-2
StatePublished - 1 Jan 2011


  • Cuprate superconductors
  • Electron-boson coupling constant
  • Ultrafast spectroscopy


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