Physics – Condensed Matter – Superconductivity
Scientific paper
2010-01-31
PhysRevB.83.184515 (2011)
Physics
Condensed Matter
Superconductivity
4pages,4figures
Scientific paper
10.1103/PhysRevB.83.184515
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.
Chen Chuangtian
Dong Xiaoli
Liu Guodong
Liu Haiyun
Lu Wei
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