Abstract
Superconducting quantum interference devices (SQUIDS) using YBa2Cu3O7 step-edge grain boundary junctions on LaAlO3 substrates were fabricated. The I–V and V-φ characteristics of these step-junction dc-SQUIDs were studied. At 77K, a square washer configuration with inductance Ls=150 pH yields flux noise of about 5.08×10−5φ0√Hz, corresponding to a magnetic field and energy resolutions were 270 ft/√Hz and 3.68×10−29 J/Hz respectively above 100 Hz.
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