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We have fabricated a 30 mm long baseline 2nd-order SQUID gradiometer from a single-layer YBa2Cu3O7 film. The gradiometer was patterned from a YBa2Cu3O7 film on a sapphire substrate by argon ion milling with a photoresist mask. The device had an overall size of 70.2 mm times 10.6 mm and a baseline of 30 mm with three parallel-aligned 10.2 mm times 10.2 mm pickup loops coupled directly to a dc SQUID...
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