Abstract
Measurements of the c-axis properties of the cuprate superconductors show anomalous behavior in both normal and superconducting states. In particular, there is strong evidence that pairs of CuO2 planes in neighboring unit cells act as Josephson junctions below the critical temperatureT c. We present a theory based on incoherent transport along the c-axis which naturally reproduces the anisotropic normal-state resistivity and the superconducting-state Josephson coupling. Applying this theory to YBa2Cu3O7-ς (YBCO), we make quantitative predictions for the strength and temperature dependence of the Josephson coupling as well as the variation ofT c with disorder. Beyond the expected low-temperature behavior, the Josephson critical current does not make a clean separation between s- and d-wave superconductors, but the disorder-inducedT c variation does. Further experimental and theoretical work along these lines may therefore help determine the order parameter symmetry in the cuprates.
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Radtke, R.J., Lau, C.N. & Levin, K. What does instrinsic Josephson coupling say about the pairing symmetry in the cuprates?. J Supercond 8, 499–502 (1995). https://doi.org/10.1007/BF00722840
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DOI: https://doi.org/10.1007/BF00722840