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Photoemission Spectroscopy of Single Crystal HTSC Materials: A Fermi Liquid Electronic Structure

  • A. J. Arko (a1), R. S. List (a1), R. J. Bartlett (a1), S. W. Cheong (a1), C. G. Olson (a2), A. -B. Yang (a2), R. Liu (a2), C. Gu (a2), B. W. Veal (a3), J. Z. Liu (a3), A. P. Paulikas (a3), K. Vandervoort (a3), H. Claus (a3) and J. C. Campuzano (a3)...

Abstract

Photoemission spectra from HTSC materials ( primarily 123 -type ), cleaved and measured at 20K, reveal a rich DOS structure which compares favorably with a calculated band structure, except for a residual 0.5 eV shift which may reflect some correlation effects. Band dispersion is observed throughout the valence bands, with clear evidence for a 0.2 eV wide band dispersing through EF. The orbital character at EF is a mix of Cu-3d and O-2p. There is unambiguous evidence for a large BCS-like gap (2Δ≥ 4kTc).

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