Title :
Characteristics of Y-Ba-Cu-O/Nb and Bi-Sr-Ca-Cu-O/Nb tunnel-type Josephson junctions
Author :
Nakayama, Akiyoshi ; Matsui, Toshiyuki ; Okabe, Yoichi
Author_Institution :
Dept. of Electr. Eng., Kanagawa Univ., Yokohama, Japan
fDate :
3/1/1991 12:00:00 AM
Abstract :
The authors fabricated Y-Ba-Cu-O/Nb and Bi-Sr-Ca-Cu-O/Nb tunnel-type junctions and observed the DC and AC Josephson effects. Gold thin films were deposited for an interlayer to protect the reaction between the base electrode and the tunnel oxide before the tunnel barrier formation. In Y-Ba-Cu-O/Au/MgOx/Nb junctions, superconducting current, hysteresis of current-voltage characteristics, and RF-induced voltage steps as high as 0.13 mV in the current-voltage characteristics were observed. Moreover, the superconducting current was modulated by the magnetic field. In Bi-Sr-Ca-Cu-O/Au/MgOx/Nb junctions, superconducting current and RF-induced voltage steps as high as 0.15 mV were also observed
Keywords :
Josephson effect; barium compounds; bismuth compounds; calcium compounds; gold; high-temperature superconductors; magnesium compounds; niobium; strontium compounds; superconducting junction devices; type II superconductors; yttrium compounds; AC Josephson effects; BiSrCaCuO-Au-MgOx-Nb; DC Josephson effects; I-V characteristics; RF-induced voltage steps; YBaCuO-Au-MgOx-Nb; high temperature superconductors; hysteresis; magnetic field; superconducting current; tunnel-type Josephson junctions; type II superconductors; Current-voltage characteristics; Gold; Josephson effect; Josephson junctions; Niobium; Protection; Sputtering; Superconducting thin films; Voltage; Yttrium barium copper oxide;
Journal_Title :
Magnetics, IEEE Transactions on
