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A Fermi Liquid Electronic Structure and the Nature of the Carriers in High-Tc Cuprates: A Photoemission Study

  • Author(s): Arko, AJ;
  • List, RS;
  • Bartlett, RJ;
  • Cheong, SW;
  • Fisk, Z;
  • Thompson, JD;
  • Olson, CG;
  • Yang, AB;
  • Liu, R;
  • Gu, C;
  • Veal, BW;
  • Liu, JZ;
  • Paulikas, AP;
  • Vandervoort, K;
  • Claus, H;
  • Campuzano, JC;
  • Schriber, JE;
  • Shinn, ND
  • et al.
Abstract

We have performed angle-integrated and angle-resolved photoemission measurements at 20 K on well-characterized single crystals of high Tc cuprates (both 1:2:3-type and 2:2:1:2-type) cleaved in situ, and find a relatively large, resolution limited Fermi edge which shows large amplitude variations with photon energy, indicative of band structure final state effects. The lineshape of the spectra of the 1:2:3 materials as a function of photon energy are well reproduced by band structure predictions, indicating a correct mix of 2p and 3d orbitals in the calculations, while the energy positions of the peaks agree with calculated bands to within approx;;0.5 eV. This may yet prove to reflect the effects of Coulomb correlation. We nevertheless conclude that a Fermi liquid approach to conductivity is appropriate. Angle-resolved data, while still incomplete, suggest agreement with the Fermi surface predicted by the LDA calculations. A BCS-like energy gap is observed in the 2:2:1:2 materials, whose magnitude is twice the weak coupling BCS value (i.e., 2Δ approx;; 7kTc). © 1990 IOP Publishing Ltd.

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