Valence bands and Fermi-surface topology of untwinned single-crystal YBa2Cu3O6.9.

The cleaved surfaces of untwinned, single-crystal YBa{sub 2}Cu{sub 3}O{sub 6.9} have been probed with synchrotron-radiation photoemission, utilizing both high energy and angular resolution. Acute spectral structure was observed, both at the Fermi energy and at higher binding energies, particularly near the high-symmetry points of the two-dimensional Brillouin zone, {bar {Gamma}}, {ital {bar X}}, {ital {bar Y}}, and {ital {bar S}}. Many band crossings of the Fermi energy were seen, with obvious and important differences between the bands near {ital {bar X}} and those near {ital {bar Y}}. A large superconducting gap was not observed: The data are consistent with a gap of less than 10 meV. The assignment of bands and Fermi-level crossings to chain and plane states will be discussed, including comparisons to the predictions of theory, particularly local-density-approximation calculations.