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Phys. Rev. B 55, 2796–2799 (1997)

Superconducting-gap anisotropy in YBa2Cu3O7-δ:mPhotoemission results on untwinned crystals

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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 British Columbia, Vancouver, British Columbia, Canada V6T 1Z1

Polarization-dependent angle-resolved photoemission studies of untwinned single crystals of YBa2Cu3O6.95 (Y123) reveal modifications of the near-Fermi-edge spectral weight which are indicative of an anisotropic superconducting gap. The measured magnitude of the leading edge shift increases monotonically from the Γ-S line toward the zone boundary, reaching a maximum value of approximately 25 meV, similar to the behavior seen in Bi2Sr2CaCu2O8+δ (Bi2212). Within experimental uncertainty, we find variation which is consistent with that expected for a dx2-y2 order parameter, providing additional evidence in support of the d-wave pairing hypothesis.

© 1997 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.55.2796
DOI:
10.1103/PhysRevB.55.2796
PACS:
74.72.Bk, 71.18.+y, 74.25.Jb, 79.60.Bm
 
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