2002/12/13 by Bart W. Hoogenboom, B. W. Hoogenboom, C. Berthod +4 · 3 citations
Earth and Planetary Sciences · Physics and Astronomy · #Advanced Condensed Matter Physics #High-pressure geophysics and materials #Physics of Superconductivity and Magnetism #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.67.224502
published as Phys. Rev. B 67, 224502 (2003) · 7 pages, with 4 figures
arxiv created 2002/12/13 · openalex publication_date 2003/06/10 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Recent angle-resolved photoemission spectroscopy (ARPES) and neutron scattering data have provided ingredients for the interpretation of scanning tunneling spectra on Bi2Sr2CaCu2O_8+\ensuremathδ. We analyze the low-temperature tunneling spectra, from oxygen overdoped to underdoped samples, including details about the bilayer splitting and the neutron resonance peak. Two van Hove singularities are identified: the first is integrated in the coherence peaks, the second is heavily broadened at higher binding energy. The shape of the tunneling spectra suggests a strong coupling of the quasiparticles with a collective mode, and a comparison with photoemission shows that the scattering rate in tunneling is an order of magnitude smaller than in ARPES. Finally, the theoretical spectra calculated with an isotropic tunneling matrix element are in better agreement with the experimental data than those obtained with anisotropic matrix elements.