Quantitative Determination of Eliashberg Function and Evidence of Strong Electron Coupling with Multiple Phonon Modes in Heavily Over doped (Bi,Pb)2Sr2CuO6

Chuangtian Chen; Feng Yang; Guiling Wang; Guodong Liu; Haiyun Liu; Jianqiao Meng; Jing Wang; Junren Shi; Lin Zhao; Qinjun Peng

arxiv: 1002.0120 · v1 · pith:WSLYUPDDnew · submitted 2010-01-31 · ❄️ cond-mat.supr-con

Quantitative Determination of Eliashberg Function and Evidence of Strong Electron Coupling with Multiple Phonon Modes in Heavily Over doped (Bi,Pb)2Sr2CuO6

Lin Zhao , Jing Wang , Junren Shi , Wentao Zhang , Haiyun Liu , Jianqiao Meng , Guodong Liu , Xiaoli Dong

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Wei Lu Guiling Wang Yong Zhu Xiaoyang Wang Qinjun Peng Zhimin Wang Shenjin Zhang Feng Yang Chuangtian Chen Zuyan Xu Xingjiang Zhou

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classification ❄️ cond-mat.supr-con

keywords heavilycouplingdispersionelectronfunctionmodesmultiplephonon

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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.

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Quantitative Determination of Eliashberg Function and Evidence of Strong Electron Coupling with Multiple Phonon Modes in Heavily Over doped (Bi,Pb)2Sr2CuO6

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