Abstract
High-resolution angle-resolved photoemission with variable excitation
energies is used to disentangle bilayer splitting effects and intrinsic
(self-energy) effects in the electronic spectral function near the
(π,0) point of differently doped (Pb,Bi)2Sr2CaCu2O8+δ. In contrast
to overdoped samples, where intrinsic effects at the (π,0) point
are virtually absent, we find in underdoped samples intrinsic effects
in the superconducting-state (π,0) spectra of the antibonding band.
This intrinsic effect is present only below the critical temperature
and weakens considerably with doping. Our results give strong support
for models which involve a strong coupling of electronic excitations
with the resonance mode seen in inelastic neutron scattering experiments.
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