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

Volume

25

Issue

2

fYear

1989

fDate

3/1/1989 12:00:00 AM

Firstpage

799

Lastpage

802

Abstract

The authors fabricated Y-Ba-Cu-O/Au/AlO_x/Nb and Y-Ba-Cu-O/AlO_x/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-AlO_x-Nb junctions; YBaCuO-Au-AlO_x-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;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.92406

Filename

92406