Abstract
A key difference between a d-wave superconductor and an anisotropic s-wave one is the expected effect of nonmagnetic point defects on Tc. For the former, Tc becomes zero, whereas for the latter, Tc reaches a nonzero constant value beyond a critical concentration of impurities. We report that Tc of single-crystal YBCO becomes less than 12K, our lowest temperature, when 4.1% of the planar oxygens O(2,3) are displaced by 400keV electrons, incident along the c-axis. Our data therefore suggest that YBCO is a d-wave superconductor. We also report a disorder-induced transition from superconductor-to-normal metal.
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Ginsberg, D.M., Giapintzakis, J. & Kirk, M.A. Evidence of order-parameter symmetry and of a normal metallic state in electron-irradiated YBa2Cu3O7−δ (YBCO). Czech J Phys 46 (Suppl 3), 1203–1204 (1996). https://doi.org/10.1007/BF02562716
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DOI: https://doi.org/10.1007/BF02562716