Low noise YBa2Cu3O7−δ grain boundary junction dc SQUIDs
作者： R. Gross , P. Chaudhari , M. Kawasaki , M. B. Ketchen , A. Gupta
DOI: 10.1063/1.103600
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摘要: We have fabricated YBa2Cu3O7−δ grain boundary junction dc superconducting quantum interference devices (SQUIDs) with a square washer geometry design. The SQUIDs were formed in c‐axis oriented epitaxial films single of predetermined nature. These show perfectly periodic voltage‐flux characteristics without hysteresis from 4.2 to 87 K. At 77 K intrinsic energy sensitivities 1.5×10−30 and 3.0×10−30 J/Hz at 10 kHz obtained for 60 110 pH SQUIDs, respectively. sensitivity limited by 1/f noise Hz was 1.2×10−28 5.5×10−28 J/Hz. SQUID voltage found be almost identical the one its junctions. flux focusing effect also measured.
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