Abstract
Bicrystal junctions and dc SQUIDs are fabricated using highly c-axis oriented (Hg,Re)Ba2CaCu2Oy thin films grown on bicrystal substrates through a high-temperature annealing process in mercury vapor. The junctions exhibit supercurrent up to 115 K and RSJ-like current-voltage characteristics. A large IcRn product of 400–460 μV is observed at 77 K in some junctions. The dc SQUIDs fabricated with such bicrystal junctions show a field-induced periodic voltage modulation up to 111 K. The 18 pH-SQUID exhibits voltage modulation depths as large as 90 μV at 77 K. The SQUID with a feedback coil is operated in a flux-locked loop scheme and shows flux noise of 10-3 Φ0/Hz1/2 at 1 Hz.
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