Abstract
Composite films of YBa 2Cu 3O 7–Au were grown on LaAlO 3 substrates using a sequential bilayer deposition process with different thickness of the Au layer. A reproducible and clear Josephson effect was observed only when the composite exhibited a labyrinth-like microstructure. Magnetic field modulation of the critical current was obtained at temperatures above 77 K. In this case gold-rich islands constrained weak-link zones, which conduced to a quasi-controlled array of Josephson junctions in the composite.
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