Superconducting electronic state in optimally doped YBa2 Cu3 O7-δ observed with laser-excited angle-resolved photoemission spectroscopy

M. Okawa*, K. Ishizaka, H. Uchiyama, H. Tadatomo, T. Masui, S. Tajima, X. Y. Wang, C. T. Chen, S. Watanabe, A. Chainani, T. Saitoh, S. Shin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

Low-energy electronic structure of optimally doped YBa2 Cu3 O7-δ is investigated using laser-excited angle-resolved photoemission spectroscopy. The surface state and the CuO chain band that usually overlap the CuO2 plane derived bands are not detected, thus enabling a clear observation of the bulk superconducting state. The observed bilayer splitting of the Fermi surface is ∼0.08-1 along (0,0) - (π,π) direction, significantly larger than Bi2 Sr2 CaCu2 O8+δ. The kink structure of the band dispersion reflecting the renormalization effect at ∼60 meV shows up similarly as in other hole-doped cuprates. The momentum dependence of the superconducting gap shows d x2 - y2 -wave-like amplitude but exhibits a nonzero minimum of ∼12 meV along the (0,0) - (π,π) direction. Possible origins of such an unexpected "nodeless" gap behavior are discussed.

Original languageEnglish
Article number144528
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume79
Issue number14
DOIs
Publication statusPublished - 2009 Apr 1
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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