Doping dependence of the gap anisotropy of the high-temperature YBa2 Cu3 O7-δ superconductor

K. Nakayama, T. Sato, K. Terashima, T. Arakane, T. Takahashi, M. Kubota, K. Ono, T. Nishizaki, Y. Takahashi, N. Kobayashi

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Abstract

We have performed high-resolution angle-resolved photoemission spectroscopy of YBa2 Cu3 O7-δ with various hole concentrations from under-to-optimal doping. We have determined the momentum dependence of bulk superconducting gap as a function of hole concentration and found the enhancement of antinodal gap, the deviation from simple d x2 - y2 wave, and the reduction of superconducting coherence weight in the underdoped region. We also found the universality of the doping dependence of the SC-gap size and symmetry in bilayered cuprates. These results suggest the importance of the long-range pairing interactions in the underdoped region.

Original languageEnglish
Article number140503
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume79
Issue number14
DOIs
Publication statusPublished - Apr 1 2009

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Nakayama, K., Sato, T., Terashima, K., Arakane, T., Takahashi, T., Kubota, M., Ono, K., Nishizaki, T., Takahashi, Y., & Kobayashi, N. (2009). Doping dependence of the gap anisotropy of the high-temperature YBa2 Cu3 O7-δ superconductor. Physical Review B - Condensed Matter and Materials Physics, 79(14), [140503]. https://doi.org/10.1103/PhysRevB.79.140503