Doping dependence of the mass enhancement in (Pb,Bi)2 Sr2 Ca Cu2 O8 at the antinodal point in the superconducting and normal state
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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