Abstract
Angle-resolved photoemission spectroscopy (ARPES) is used to study
the doping dependence of the lifetime and the mass renormalization
of the low-energy excitations in high-Tc cuprate (Bi,Pb)2Sr2CaCu2O8
along the zone diagonal. We find a linear energy dependence of the
scattering rate for the underdoped samples and a quadratic energy
dependence for the overdoped case. The mass enhancement of the quasiparticles
due to the many body effects at the Fermi energy is found to be in
the order of 2 and the renormalization extends over a large energy
range for both the normal and the superconducting state. The much
discussed kink in the dispersion around 70 meV is interpreted as
a small additional effect at low temperatures.
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