Abstract
c-axis oriented and 11/spl deg/ tilted YBa/sub 2/Cu/sub 3/O/sub x/ (YBCO) thin films were deposited on [110] NdGaO/sub 3/ and (7 10 2) NdGaO/sub 3/ substrates correspondingly. Nb/Au/YBCO heterojunctions were fabricated using photolithography and ion beam milling. I-V curves of the heterojunctions based on tilted YBCO films showed zero bias anomaly conductance peak and large excess current. We observed the second harmonic (/spl prop/ sin 2/spl phi/) of superconducting current in Nb/Au/YBCO heterojunctions in c-axis oriented YBCO films, although sinusoidal superconducting current-phase relation has been measured for heterojunctions in tilted ones. The obtained results are explained by d/spl plusmn/s symmetry of YBCO superconducting order parameter.
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