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I-V Characteristic of YBCO Step-Edge Josephson Junction
Keiichi YAMAGUCHI Shuichi YOSHIKAWA Tsuyoshi TAKENAKA Syuichi FUJINO Kunihiko HAYASHI Tsutomu MITSUZUKA Katsumi SUZUKI Youichi ENOMOTO
IEICE TRANSACTIONS on Electronics
Publication Date: 1994/08/25
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Superconducting Devices)
Josephson junction, high Tc superconductor, I-V characteristics, device application,
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Step-edge Josephson junctions (SEJJs), which are made by YBa2Cu3O7 (YBCO) thin films on MgO (100) substrates with gentle step angle (below 40 degrees) have been successfully fabricated. The step-edge, with several angles on the MgO substrate, were made using photolithography and Ar ion beam etching, and then YBCO films were deposited on the step-edges by pulsed laser deposition method. The relationships between step-angles and I-V characteristics, microwave properties and structure of SEJJs were systematically investigated. Shapiro steps were clearly observed only in step-angle range between 10 and 30 degrees. Intermittence and hysteresis on the I-V characteristics were observed above 30 mA without effect from step-angles.