YBa2Cu3O7 Bicrystal Josephson Junctions and dc SQUIDs
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Yu. V. Kislinskii,
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ZHAO Bai-ru,
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WU Pei-jun,
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PENG Zhi-qiang,
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CHEN Ying-fei,
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YANG Tao,
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CHEN Lie,
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SUN Ji-jun,
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XU Bo,
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WU Fei,
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ZHOU Yue-liang,
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LI Lin,
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ZHAO Zhong-xian,
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E. A. Stepantsov
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Abstract
Bicrystal Josephson junctions and direct current superconducting quantum interference devices ( dc SQUIDs) were prepares on YBa2Cu3O7( YBCO ) thin films deposited on yttrium stabilized ZrO2 bicrystal substrates The critical current densities Jc ~ 2 X 106 A/cm2 for YBCO thin film and (1 - 3 ) X 103 A/cm2 at boundaries were obtained at 77K. 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 X 40μm of loop and 2000 X 2000μm planar superconductive flux focuser. The voltage modulation depth of this SQUID was 6μV, and the magnetic field sensitivity was estimated to be ~ 2pT /√Hz from the measured noise level.
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