Superconducting-gap anisotropy in YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}: Photoemission results on untwinned crystals
- Department of Applied Physics, Stanford University, Stanford, California 94305 (United States)
- Department of Applied Physics, Department of Physics, and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305 (United States)
- Department of Applied Physics and Department of Physics, Stanford University, Stanford, California 94305 (United States)
- Department of Applied Physics and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305 (United States)
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, V6T 1Z1 (CANADA)
Polarization-dependent angle-resolved photoemission studiesofuntwinnedsinglecrystalsofYBa{sub 2}Cu{sub 3}O{sub 6.95} (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 {Gamma}{minus}S line toward the zone boundary, reaching a maximum value of approximately 25 meV, similar to the behavior seen in Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} (Bi2212). Within experimental uncertainty, we find variation which is consistent with that expected for a d{sub x{sup 2}{minus}y{sup 2}} order parameter, providing additional evidence in support of the d-wave pairing hypothesis. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 450358
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 5 Vol. 55; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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