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(Hg,Re)1212 bicrystal grain boundary Josephson junctions and dc SQUIDs

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7 Author(s)
Tsukamoto, A. ; Adv. Res. Lab., Hitachi Ltd., Tokyo, Japan ; Takagi, K. ; Moriwaki, Y. ; Sugano, T.
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Bicrystal grain boundary junctions and dc SQUIDs are fabricated using c-axis oriented (Hg,Re)-1212 thin films grown on 24/spl deg/ SrTiO/sub 3/ bicrystal substrates, The junctions exhibit supercurrents up to a temperature close to the film T/sub c/ of 118 K and RSJ-like current-voltage characteristics. A large I/sub C/R/sub n/ product of 400-460 /spl mu/V is observed at 77 K in some junctions. The dc SQUIDs show a field-induced periodic voltage up to 111 K. The 18 pH-SQUID exhibit voltage modulation depths as large as 90 /spl mu/V (at 77 K), 27 /spl mu/V (at 97 K), and 1-2 /spl mu/V (at 110 K). The SQUID with a feedback coil is operated in a flux-locked loop scheme and shows flux noise of 10/sup -3/ /spl phi//sub 0//Hz/sup 1/2/ at 1 Hz.

Published in:

Applied Superconductivity, IEEE Transactions on  (Volume:9 ,  Issue: 2 )

Date of Publication:

June 1999

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