Bulk and surface low-energy excitations in Y Ba2 Cu3 O7-δ studied by high-resolution angle-resolved photoemission spectroscopy

K. Nakayama, T. Sato, K. Terashima, H. Matsui, 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 on Y Ba2 Cu3 O7-δ (Y123; δ=0.06; Tc =92 K). By accurately determining the Fermi surface and energy band dispersion, we solve long-standing controversial issues as to the anomalous electronic states of Y-based high- Tc cuprates. We unambiguously identified surface-bilayer-derived bonding and antibonding bands, together with their bulk counterparts. The surface bands are highly overdoped (hole concentration x=0.29), showing no evidence for the gap opening or the dispersion anomaly in the antinodal region, while the bulk bands show a clear d x2 - y2 -wave superconducting gap and the Bogoliubov quasiparticlelike behavior with a characteristic energy scale of 50-60 meV indicative of a strong electron-boson coupling in the superconducting state. All these results suggest that the metallic and superconducting states coexist at the adjacent bilayer of Y123 surface.

Original languageEnglish
Article number014513
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume75
Issue number1
DOIs
Publication statusPublished - Jan 29 2007

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Nakayama, K., Sato, T., Terashima, K., Matsui, H., Takahashi, T., Kubota, M., Ono, K., Nishizaki, T., Takahashi, Y., & Kobayashi, N. (2007). Bulk and surface low-energy excitations in Y Ba2 Cu3 O7-δ studied by high-resolution angle-resolved photoemission spectroscopy. Physical Review B - Condensed Matter and Materials Physics, 75(1), [014513]. https://doi.org/10.1103/PhysRevB.75.014513