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We performed a Laser angle-resolved photoemission spectroscopy (ARPES) studyon a wide doping range of Ba1-xKxFe2As2 (BaK) iron-based superconductor. Weobserved a robust low-binding energy (BE) kink structure in the dispersionwhich is doping dependent where its energy peaks at the optimally-doped (OP)level (x~0.4) and decreases towards the underdoped (UD) and overdoped (OD)sides. It is also temperature-dependent and survives up to ~90K. We attributethis kink to electron-mode coupling in good agreement with the inelasticneutron scattering (INS) and scanning tunneling microscopy (STM) results on thesame compound which observed a similar bosonic mode associated with spinexcitations. The relation between the mode energy ({\Omega}) and the SCtransition temperature (Tc) deduced from our Laser ARPES data follow theuniversal relation deduced from INS and STM. In addition, we could resolveanother kink at higher BE showing less doping and temperature dependence andmay thus be of different origin.

Evidence of a universal relation between electron-mode coupling and Tc in Ba1-xKxFe2As2 superconductor from Laser ARPES