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. A modulation voltage exceeding 16 μV was attained with Ls = 60 pH at 77 K. At 77 K, a square washer configuration with inductance Ls = 150 pH yields flux noise of about 5.08×10-5 Φ0/√ Hz at frequencies above 100 Hz, increasing to 1.1×10-4 Φ0/√Hz below 1 Hz. The corresponding magnetic field and energy resolution were 270 fT/√Hz and 3.68×10-29 J/Hz respectively, above 100 Hz, and increasing to 710 fT√Hz and 1.8×10-28 J/Hz over a signal frequency range to below 1 Hz.
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