We have fabricated Y-Ba-Cu-O/ Au/AIOx/Nb and Y-Ba-Cu-O/AIOx/Nb Josephson tunnel junctions using electron-beam evaporation of A1 and Nb films and natural oxidation. Sintered Y-Ba-Cu-0 have been used as base electrode. Superconducting Josephson current and hysteresis of currentvoltage characteristics, which are typical features of Josephson tunnel junctions, have been observed at 4.2 K. Rf-induced voltage steps at the voltage greater than 0.4 mV have been clearly observed and rf-induced subharmonic steps have also appeared. Moreover, the Superconducting Josephson current has been modulated by magnetic field.
Y-BA-CU-O/NB JOSEPHSON TUNNEL-JUNCTIONS
IEEE_M_1989_25_2_799.pdf
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