YBa2Cu3O7 Bicrystal Josephson Junctions and dc SQUIDs
Yu. V. Kislinskii1, ZHAO Bai-ru, WU Pei-jun, PENG Zhi-qiang, CHEN Ying-fei, YANG Tao, CHEN Lie, SUN Ji-jun, XU Bo, WU Fei, ZHOU Yue-liang, LI Lin, ZHAO Zhong-xian, E. A. Stepantsov2
Institute of physics, Chinese Academy of Sciences, Beijing 100080
1Permanent address : Institute of Crystallography, 117333, Moscow, Russia
2Institute of Crystallography, 117333, Moscow, Russia
YBa2Cu3O7 Bicrystal Josephson Junctions and dc SQUIDs
Yu. V. Kislinskii1;ZHAO Bai-ru;WU Pei-jun;PENG Zhi-qiang;CHEN Ying-fei;YANG Tao;CHEN Lie;SUN Ji-jun;XU Bo;WU Fei;ZHOU Yue-liang;LI Lin;ZHAO Zhong-xian;E. A. Stepantsov2
Institute of physics, Chinese Academy of Sciences, Beijing 100080
1Permanent address : Institute of Crystallography, 117333, Moscow, Russia
2Institute of Crystallography, 117333, Moscow, Russia
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.
1996, Vol. 13 
