Doping dependence of the mass enhancement in (Pb,Bi)2 Sr2 Ca Cu2 O8 at the antinodal point in the superconducting and normal state
T. K. Kim, A. A. Kordyuk, S. V. Borisenko, A. Koitzsch, M. Knupfer, H. Berger, J. Fink
Abstract
Angle-resolved photoemission spectroscopy (ARPES) is used to study the mass renormalization of the charge carriers in the high-Tc superconductor (Pb,Bi)2Sr2CaCu2O8 in the vicinity of the (pi,0) point in the superconducting and the normal state. 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 anisotropic coupling to a bosonic collective mode is observed below Tc for both bands in particular for the underdoped case. Above Tc, the more isotropic coupling to a continuum or a mode at much higher energy is significantly weaker.
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