Abstract
We have developed dc superconducting quantum interference devices (SQUIDs) with bicrystal grain boundary junctions of BiSrCaCuO thin film on SrTiO3 (100) bicrystal substrates with a misorientation angle of 36.8°. The Tc and Je of the BSCCO film were 93 K and 3×105 A/cm2 at 77 K, respectively. The I-V characteristics of the SQUIDs were of resistively shunted junction (RSJ) type. The SQUID with 20-µm wide junctions showed a Fraunhofer-like flux-voltage characteristics. These SQUIDs operated at 77 K. The IoRn product and the modulation voltage of the SQUID with 10-µm wide junctions were 17 µV and 6 µV at 77 K, respectively. The flux noise as measured in a flux locked loop mode was 2.3×10−5 Φ0/Hz0.5 in the white noise region.
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