Angle-resolved photoemission on untwinned YBa2Cu3O6.95. I. Electronic structure and dispersion relations of surface and bulk bands

Matthias Schabel, C. H. Park, A. Matsuura, Z. X. Shen, D. A. Bonn, Ruixing Liang, W. N. Hardy

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Abstract

Angle-resolved photoemission studies of the dispersion relations and polarization dependence of bands in the near EF region of untwinned YBa2Cu3O7-δ (Y123) single crystals reveal previously unseen details of the electronic structure and significantly expand our understanding of this system. We find that the narrow, intense feature seen along ΓY in Y123 and YBa2Cu4O8 (Y 124) is best explained as a surface termination effect related to the quasi-one-dimensional CuO3 chains, masking underlying electronic states at the Fermi energy. Many of the previously puzzling photoemission results from these materials are readily understood within this context, including the failure to observe a superconducting gap, the weak effect of deoxygenation on the photoemission spectra for δ≤0.5, the weak dependence of this feature on Pr doping, and the strong photon energy dependence of the photoemission spectra. Our data, taken in the superconducting state, reveal the bilayer splitting and c-axis dispersion of the CuO2 plane bands. We also find evidence for a one-dimensional chain Fermi surface parallel to the ΓX direction, but see no indication of the BaO derived "stick" pocket centered on the 5 point.

Original languageEnglish (US)
Pages (from-to)6090-6106
Number of pages17
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume57
Issue number10
StatePublished - Mar 1 1998
Externally publishedYes

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photoelectric emission
electronic structure
deoxygenation
masking
Fermi surfaces
indication
energy
single crystals
photons
polarization
electronics

ASJC Scopus subject areas

  • Condensed Matter Physics

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Angle-resolved photoemission on untwinned YBa2Cu3O6.95. I. Electronic structure and dispersion relations of surface and bulk bands. / Schabel, Matthias; Park, C. H.; Matsuura, A.; Shen, Z. X.; Bonn, D. A.; Liang, Ruixing; Hardy, W. N.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 57, No. 10, 01.03.1998, p. 6090-6106.

Research output: Contribution to journalArticle

Schabel, Matthias ; Park, C. H. ; Matsuura, A. ; Shen, Z. X. ; Bonn, D. A. ; Liang, Ruixing ; Hardy, W. N. / Angle-resolved photoemission on untwinned YBa2Cu3O6.95. I. Electronic structure and dispersion relations of surface and bulk bands. In: Physical Review B - Condensed Matter and Materials Physics. 1998 ; Vol. 57, No. 10. pp. 6090-6106.
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