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

Research output: Contribution to journalArticlepeer-review

19 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

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Fingerprint

Dive into the research topics of 'Superconducting electronic state in optimally doped YBa2 Cu3 O7-δ observed with laser-excited angle-resolved photoemission spectroscopy'. Together they form a unique fingerprint.

Cite this