Abstract
Bicrystal Josephson junctions and direct current superconducting quantum interference devices (dc SQUIDs) were prepared on YBa2Cu3O7 (YBCO) thin films deposited on yttrium stabilized ZrO2 bicrystal substrates. The critical current densities Jc similar 2 × 106 A/cm2 for YBCO thin film and (1 - 3) × 103 A/cm2 at boundaries were obtained at 77 K. For YBCO Josephson junction made on 28° misorientated boundary, the Shapiro steps were observed. The dc SQUID was made on the 32° misorientated boundary junctions, which consisted of 40 × 40 μm of loop and 2000 × 2000 μm planar superconductive flux focuser. The voltage modulation depth of this SQUID was 6μV, and the magnetic field sensitivity was estimated to be similar 2 pT/√Hz from the measured noise level.
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