2002/09/18 by S. V. Borisenko, С. В. Борисенко, A. A. Kordyuk +9 · 5 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Iron-based superconductors research #Physics of Superconductivity and Magnetism #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.90.207001
published as Phys. Rev. Lett. 90, 207001 (2003) · 4 RevTEX pages, 3 figures
arxiv created 2002/09/18 · openalex publication_date 2003/05/19 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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 (\ensuremathπ,0) point of differently doped (Pb,Bi)2Sr2CaCu2O_8+\ensuremathδ. In contrast to overdoped samples, where intrinsic effects at the (\ensuremathπ,0) point are virtually absent, we find in underdoped samples intrinsic effects in the superconducting-state (\ensuremathπ,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.