High-Tc superconductor-normal metal-superconductor Josephson microbridges with high-resistance normal metal links

• Published in: Applied physics letters Vol. 59; no. 9; pp. 1126 - 1128
• Main Authors: ONO, R. H, BEALL, J. A, CROMAR, M. W, HARVEY, T. E, JOHANSSON, M. E, REINTSEMA, C. D, RUDMAN, D. A
• Format: Journal Article
• Language: English
• Published: Melville, NY American Institute of Physics 26-08-1991
• Subjects: Applied sciences; Electronics; Exact sciences and technology; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Superconducting devices; Silver Gold Alloys; Superconductor metal contact; Microelectronic fabrication; Voltage current curve; Josephson effect; Superconductor bridge; Manufacturing process; Microstructure; Barium Copper Yttrium Oxides Mixed; High temperature superconductor
• ISSN: 0003-6951; 1077-3118
• DOI: 10.1063/1.106365

An in situ process for fabricating high transition temperature superconductor-normal metal-superconductor microbridges has been developed using a step edge to define the normal metal length. Critical current- normal resistance products over 1 mV have been measured at low temperature in devices with high-resistivity Ag-Au alloy bridges. Results on samples with Ag bridges are compared with the alloy data as an initial test of recent theoreis of SNS Josephson junctions. Josephson effects have been demonstrated in these devices at temperatures higher than 80 K. Clearly defined rf steps have been observed, with power dependence qualitatively similar to theoretical predictions. (Author)