A. Paccagnella, A.C. Callegari, et al.
Journal of Applied Physics
We have developed a process for the fabrication of YBaCuO high-T c junctions based on the step-edge weak-link concept. The process emphasizes the creation of sharp and straight step edges on a substrate, and the restoration of oxygen content for superconducting materials at the step edges. A diamond-like carbon film is used as an ion milling mask for the creation of steps on substrates such as LaAlO3 and SrTiO3. Room-temperature plasma oxidation is shown to be effective in restoring T c from processing related degradation for grains residing at the step edge. Using this process, dc SQUIDs were fabricated with 77 K electrical performances matching, and in certain cases exceeding, similar SQUIDs made using bicrystal-based tilt-boundary weak-link junctions.
A. Paccagnella, A.C. Callegari, et al.
Journal of Applied Physics
B. Oh, R.H. Koch, et al.
Physical Review B
A.C. Callegari, E.T-S. Pan, et al.
Applied Physics Letters
A.C. Callegari, D. Ralph, et al.
Journal of Applied Physics