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Phys. Rev. B 57, 6107–6115 (1998)

Angle-resolved photoemission on untwinned YBa2Cu3O6.95. II. Determination of Fermi surfaces

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Matthias C. Schabel
Department of Applied Physics, Stanford University, Stanford, California 94305

C.-H. Park
Department of Applied Physics, Department of Physics, and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305

A. Matsuura
Department of Applied Physics and Department of Physics, Stanford University, Stanford, California 94305

Z.-X. Shen
Department of Applied Physics and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305

D. A. Bonn, Ruixing Liang, and W. N. Hardy
Department of Physics and Astronomy, University of Bristish Columbia, Vancouver, British Columbia, Canada V6T 1Z1

Received 25 July 1997; published in the issue dated 1 March 1998

We present complete Fermi-surface mappings of an untwinned single crystal of YBa2Cu3O7-δ in two distinct photon polarization geometries. Various methods for Fermi-surface determination with angle-resolved photoelectron spectroscopy are discussed and a technique based on the momentum space density of states is developed and applied. The data reveal the presence of two CuO2 plane-derived Fermi-surface pockets, along with weak evidence for a single chain sheet, in agreement with earlier work on twinned crystals and ab initio predictions, but show no sign of the expected “stick” pocket centered at (π,π). In contrast with earlier work on Bi2Sr2CaCu2O8+δ, we see no evidence for “shadow bands” in optimally doped YBa2Cu3O7-δ, supporting the contention that these features arise from structural rather than magnetic correlations.

© 1998 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.57.6107
DOI:
10.1103/PhysRevB.57.6107
PACS:
71.18.+y, 74.72.Bk, 79.60.-i
 
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