d-wave peculiarities of YBCO-based Josephson junctions

  • Il'Ichev E
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Several configurations of YBa2Cu3Ox(YBCO)-based Josephson junctions have been experimentally investigated. For symmetric 45° grain boundary Josephson junctions was found: (i) The critical current exhibits, as a function of temperature, a local minimum. (ii) The first harmonic of the current phase relationship I(φ) changes sign. For asymmetric 45° grain boundary junctions the current phase relation has been found to be close to sin(2φ). For Nb/Au/(0 0 1)YBCO heterojunctions formed along the c-axis, the finite amplitude of the second harmonic in the current phase relationship was found as well. The results are in good agreement with a microscopic model of Josephson junctions in the frame of the d-wave scenario. © 2002 Elsevier Science B.V. All rights reserved.

Author-supplied keywords

  • Current-phase relation
  • Grain boundary
  • Josephson junctions
  • d-Wave pairing state

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  • E. Il'Ichev

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