Phys. Rev. B 35, 8846–8849 (1987)Tunneling and infrared measurements of the energy gap in the high-critical-temperature superconductor Y-Ba-Cu-O
We have measured the superconducting energy gap Δ of high-critical-temperature (Tc∼90 K) YBa2Cu3O9-y samples using tunneling and infrared techniques. From our tunneling data, we place limits on the reduced superconducting energy gap of 3.7<2Δ/kBTc<5.6. The tunneling gaps for a single-crystal sample are essentially the same if the tunneling tip is oriented either parallel or perpendicular to the CuO planes. The infrared measurements give a smaller apparent gap. We discuss the origins of the differences between the infrared and tunneling results. © 1987 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.35.8846
DOI:
10.1103/PhysRevB.35.8846
PACS:
74.10.+v, 74.50.+r, 74.70.Mq
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