Quantitative Determination of Eliashberg Function and Evidence of Strong Electron Coupling with Multiple Phonon Modes in Heavily Over doped (Bi,Pb)2Sr2CuO6
Super-high resolution laser-based angle-resolved photoemission spectroscopy measurements have been carried out on a heavily overdoped (Bi,Pb)2Sr2CuO6 (Tc> 5 K) superconductor. Taking advantage of the high-precision data on the subtle change of the quasi-particle dispersion at different temperatures, we develop a general procedure to determine the bare band dispersion and extract the bosonic spectral function quantitatively. Our results show unambiguously that the 70 meV nodal kink is due to the electron coupling with the multiple phonon modes, with a large mass enhancement factor Lamda= 0.42 even in the heavily over-doped regime.
@article{arxiv.1002.0120,
title = {Quantitative Determination of Eliashberg Function and Evidence of Strong Electron Coupling with Multiple Phonon Modes in Heavily Over doped (Bi,Pb)2Sr2CuO6},
author = {Lin Zhao and Jing Wang and Junren Shi and Wentao Zhang and Haiyun Liu and Jianqiao Meng and Guodong Liu and Xiaoli Dong and Wei Lu and Guiling Wang and Yong Zhu and Xiaoyang Wang and Qinjun Peng and Zhimin Wang and Shenjin Zhang and Feng Yang and Chuangtian Chen and Zuyan Xu and Xingjiang Zhou},
journal= {arXiv preprint arXiv:1002.0120},
year = {2011}
}