title: Doping dependence of the mass enhancement in (Pb,Bi)2Sr2CaCu2O8 at the antinodal point in the superconducting and normal states.
abstract: Angle-resolved photoemission spectroscopy is used to study the mass renormalization of the charge carriers in the high-T(c) superconductor (Pb,Bi)2Sr2CaCu2O8 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.
authors: Leibniz-Institute for Solid State and Materials Research Dresden, P.O.Box 270116, D-01171 Dresden, Germany.
authors: T K
authors: TK
authors: Kim
authors: A A
authors: AA
authors: Kordyuk
authors: S V
authors: SV
authors: Borisenko
authors: A
authors: A
authors: Koitzsch
authors: M
authors: M
authors: Knupfer
authors: H
authors: H
authors: Berger
authors: J
authors: J
authors: Fink