Evidence for unconventional superconductivity in YBa2Cu3O6.9

  title={Evidence for unconventional superconductivity in YBa2Cu3O6.9},
  author={D. A. Brawner and Hans Rudolf Ott},
Abstract We report measurements of the dynamic resistance of a dc-SQUID formed by two contacts between two different edges of a single crystal of YBa 2 Cu 3 O 6.9 and a Nb block. The phase of the field induced R D oscillations was compared with those of two adjacent SQUIDs, each formed by two NbNb contacts. We find a phase difference of 160±30° between the oscillations of the composite SQUID and those of the SQUIDs formed by NbNb junctions. A possible explanation for this reproducible effect… CONTINUE READING