Title :
Y-Ba-Cu-O/Nb Josephson tunnel junctions
Author :
Nakayama, Akiyoshi ; Inoue, Atsuki ; Takeuchi, Kiyoshi ; Ito, Hiroyuki ; Okabe, Yoichi
Author_Institution :
Dept. of Electr. Eng., Kanagawa Univ., Yokohama, Japan
fDate :
3/1/1989 12:00:00 AM
Abstract :
The authors fabricated Y-Ba-Cu-O/Au/AlOx/Nb and Y-Ba-Cu-O/AlOx/Nb Josephson tunnel junctions using electron-beam evaporation of Al and Nb films and natural oxidation. Sintered Y-Ba-Cu-O was used as the base electrode. Superconducting Josephson current and hysteresis of the current-voltage characteristics, which are typical features of Josephson tunnel junctions, have been observed at 4.2 K. RF-induced voltage steps at a voltage greater than 0.4 mV have been clearly observed, and RF-induced subharmonic steps have also appeared. The superconducting Josephson current was modulated by the magnetic field
Keywords :
Josephson effect; barium compounds; high-temperature superconductors; magnetic field effects; yttrium compounds; 0.4 mV; 4.2 K; I/V curves; Josephson tunnel junctions; RF-induced subharmonic steps; RF-induced voltage steps; YBaCuO-AlOx-Nb junctions; YBaCuO-Au-AlOx-Nb junctions; current-voltage characteristics; electron-beam evaporation; features; high temperature superconductor; hysteresis; magnetic field modulated current; natural oxidation; sintered YBaCuO; superconducting Josephson current; Electrodes; Gold; Josephson effect; Josephson junctions; Magnetic hysteresis; Niobium; Oxidation; Superconducting films; Voltage; Yttrium barium copper oxide;
Journal_Title :
Magnetics, IEEE Transactions on
