Kp. Daly et al., INTEGRATION OF STEP-EDGE GRAIN-BOUNDARY JOSEPHSON-JUNCTIONS WITH YBCOMULTILAYERS FOR ELECTRONICS APPLICATIONS, IEEE transactions on applied superconductivity, 5(2), 1995, pp. 3131-3134
We discuss our multilayer YBCO process which uses step-edge junctions.
Key issues are dielectric defect density, wiring layer critical curre
nt over edges of underlying features and junction critical current uni
formity. We have demonstrated an average defect density of about 450/c
m(2) over many wafers. Wiring critical current exceeds 1 mA/mu m of li
ne width. We have demonstrated SQUIDs at 77 K using this process.