2013/05/27 by Yingying Peng, Jianqiao Meng, Lin Zhao +9 · 1 citation
Physics and Astronomy · #cond-mat.supr-con
paper · pdf · doi:10.1088/0256-307x/30/6/067402
published as CHIN. PHYS. LETT. Vol. 30, No. 6 (2013) 067402
arxiv created 2013/05/27 · arxiv updated 2013/05/28
High resolution laser-based angle-resolved photoemission measurements have been carried out on Bi2Sr2CuO6+d superconductor covering a wide doping range from heavily underdoped to heavily overdoped samples. Two obvious energy scales are identified in the nodal dispersions: one is the well-known 50-80 meV high energy kink and the other is <10 meV low energy kink. The high energy kink increases monotonously in its energy scale with increasing doping and shows weak temperature dependence, while the low energy kink exhibits a non-monotonic doping dependence with its coupling strength enhanced sharply below Tc. These systematic investigations on the doping and temperature dependence of these two energy scales favor electron-phonon interactions as their origin. They point to the importance in involving the electron-phonon coupling in understanding the physical properties and the superconductivity mechanism of high temperature cuprate superconductors.