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 |