Abstract
Superconducting quantum interference devices (dc SQUIDs) were fabricated from high-temperature superconducting YBa2Cu3O7 thin films, using nanobridges as weak links. The weak link behavior in these devices caused by coherent motion of vortices was observed for bridges with dimensions smaller than the effective penetration depth, which was approximately 400–600 nm for the films. The dc SQUIDs consisted of two parallel nanobridges with widths of 100–500 nm. The size of the SQUID hole ranged from 2×2 to 2×10 μm2. The SQUIDs were operated in the temperature range from liquid helium up to 85 K and showed voltage modulations as a function of an applied magnetic field. At 75 K peak-to-peak values of 15 μV were observed. The flux noise at 4.2 K was determined to be smaller than 8×10−5 φ0 /√Hz.
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