Fabrication snd Characteristics of Sandwich-Type Bi2Sr2Ca1Cu2Ox/Bi2Sr2Cu1Oy/Bi2Sr2Ca1Cu2Oz Josephson Junctions

Koichi MIZUNO  Hidetaka HIGASHINO  Kentaro SETSUNE  Kiyotaka WASA  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E75-C   No.8   pp.935-942
Publication Date: 1992/08/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Cryogenic Microwave Devices)
Category: Active Devices
Keyword: 
superconductive electronics,  high-Tc superconductor,  Josephson junction,  Bi-Sr-Ca-Cu-O,  S/N/S,  

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Summary: 
Sandwich-type Josephson junctions with the structure Bi2Sr2Ca1Cu2Ox/Bi2Sr2Cu1Oy/Bi2Sr2Ca1Cu2Oz (BSCCO/BSCO/BSCCO), have been fabricated and their characterstics determined. The BSCO barrier layer, which is characterized by a crystal structure close to that of the BSCCO electrode layer, is a normal conductor at 4.2 K. Superconductor/normal-conductor/superconductor (S/N/S) type current-voltage characteristics are obtained with these junctions. Distinctive Shapiro steps are observed when they are exposed to microwave radiation. An oscillating behavior of each step in their I-V characteristics are confirmed for increased microwave power. The critical current, Ic, is found to be proportional to (1-T/Tc)2 in the neighborhood of Tc. These results coincide with the ones observed with conventional S/N/S junctions.