Doping dependence of the mass enhancement in (Pb,Bi)2Sr2CaCu2O8 at the antinodal point in the superconducting and normal states -: art. no. 167002

Angle-resolved photoemission spectroscopy is used to study the mass renormalization of the charge carriers in the high-T-c superconductor (Pb,Bi)(2)Sr2CaCu2O8 in the vicinity of the (pi,0) point in the superconducting and the normal states. Using matrix element effects at different photon energies and due to a high momentum and energy resolution the bonding and the antibonding bands could be separated in the whole dopant range. A huge coupling to a bosonic collective mode is observed below T-c for both bands, in particular, for the underdoped case. Above T-c, a weaker coupling to a continuous spectrum of modes is detected.