標題: Electron-Boson Coupling Constant of Oxygen-Deficient Y0.7Ca0.3Ba2Cu3O7-delta Measured by Ultrafast Spectroscopy
作者: Luo, C. W.
Chen, J. -Y.
Huang, T. C.
Wu, K. H.
Lin, J. -Y.
Juang, J. Y.
Uen, T. M.
電子物理學系
物理研究所
Department of Electrophysics
Institute of Physics
關鍵字: Cuprate superconductors;Electron-boson coupling constant;Ultrafast spectroscopy
公開日期: 1-一月-2011
摘要: The ultrafast dynamics in an (001) oxygen-deficient Y0.7Ca0.3Ba2Cu3O7-delta 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 lambda could be directly obtained from the relaxation time of the transient reflectivity change (Delta R/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 Delta R/R is around 4.32 ps and 3.66 ps, respectively, which correspond to lambda similar to 0.06. However, the lambda become larger (similar to 0.15) in the optimal doped region with T (c)=82.1 K while the relaxation time of Delta R/R shrinks to similar to 1.51 ps. These results indicate that the lambda is strongly hole-doping dependent, which may govern the T (c) of cuprate superconductors.
URI: http://dx.doi.org/10.1007/s10948-010-0918-2
http://hdl.handle.net/11536/150290
ISSN: 1557-1939
DOI: 10.1007/s10948-010-0918-2
期刊: JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
Volume: 24
起始頁: 189
結束頁: 191
顯示於類別:期刊論文