Abstract
Detailed measurements of Josephson tunneling between ${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7\mathrm{\ensuremath{-}}\mathit{y}}$ (YBCO) and Pb using YBCO/[MgO (or native barrier)]/Pb junctions with YBCO films either c-axis or a-axis oriented are presented. In the case of the c-axis-oriented films, the dependence of the Josephson critical current on the applied magnetic field exhibits diffraction patterns close to that characteristic of a d-wave superconductor. The temperature dependence of the Josephson critical current also shows an anomalous behavior. Incidentally, the diffraction pattern exhibits less-sensitive behavior to magnetic fields at low temperatures. These results suggest the possibility of d-wave symmetry for a YBCO superconductor.
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