What the resonance peak does

Details What the resonance peak does What the resonance peak does

2002-09-18

arxiv.org/abs/cond-mat/0209435v1

Phys. Rev. Lett. 90, 207001 (2003)

Physics

Condensed Matter

Superconductivity

4 RevTEX pages, 3 figures

Scientific paper

10.1103/PhysRevLett.90.207001

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 ($\pi$,0)-point of differently doped (Pb,Bi)$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$. In contrast to overdoped samples, where intrinsic effects at the ($\pi$,0)point are virtually absent, we find in underdoped samples \textit{intrinsic} effects in the superconducting-state ($\pi$,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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