Abstract
Thin films of YBa/sub 2/Cu/sub 3/O/sub 7/ (YBCO) have been deposited on LaAlO/sub 3/ substrates previously textured with submicron features by the use of natural lithography (the use of monolayers of polystyrene microspheres as lithographic masks). This weakens the superconducting properties, due to reduced connectivity in the film. Devices fabricated using localized textured regions have shown Josephson coupling. Weak links have shown Shapiro steps at the expected voltage intervals. Magnetic-field-induced modulation in the detected RF voltage with the geometrically correct periodicity has been observed in RF SQUIDs over a limited temperature range.
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