Ca. Hollin et al., SPATIALLY-RESOLVED CRITICAL-CURRENT LIMITATIONS IN YBA2CU3O7 MULTILAYER STRUCTURES, Applied physics letters, 64(7), 1994, pp. 918-920
Current flow in YBa2Cu3O7/PrBa2Cu3O7 multilayer structures has been st
udied using low temperature, scanning electron microscope, beam-induce
d voltage contrast. Specialized data acquisition has been used to limi
t thermalization effects and improve resolution. For both via hole con
tacts and crossovers, the lowest critical current densities were found
at steps where the superconductor tracks climb up or down over patter
ned edges of the insulator.