DC Superconducting Quantum Interference Devices with BiSrCaCuO Bicrystal Grain Boundary Junctions at 77 K
Year: 1996
Type: article
Abstract: We have developed dc superconducting quantum interference devices (SQUIDs) with grain boundary junctions of a BiSrCaCuO (BSCCO) thin film on a SrTiO3 (100) bicrystal substrate with a misorientation angle of 36.8°. The T c and J c of the BSCCO film were 93 K and 3×105 A/cm2 at 77 K, respectively. These SQUIDs operated at 77 K. The I-V characteristics of the SQUIDs were of resistively shunted junction (RSJ) type. A SQUID with 20-µ m-wide junctions showed Fraunhofer-like flux-voltage characteristics. The I 0 R n product and the modulation voltage of a SQUID with 10-µ m-wide junctions were 23 µ V and 6 µ V at 77 K, respectively. The flux noise measured in a flux-locked loop mode was 2.0×10-5Φ0/ Hz0.5 in the white noise region.
DOI: 10.1143/jjap.35.l391
Authors: Tetsuya Takami, Ken'ichi Kuroda, Junji Tanimura, Kazuyoshi Kojima, Masahiro Nunoshita Hirota
Institution: Mitsubishi Electric (Japan)
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2094395984