Properties of Josephson Junction Fabricated on Bicrystal Substrate with Different Misorientation Angles

In order to develop YBa 2 Cu 3 O 7-δ bicrystal junctions suitable for high-performance superconducting quantum interference device (SQUID), the relationship between the junction properties and the misorientation angle of the bicrystal substrate is studied experimentally. Misorientation angles of 24°...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 1998-06, Vol.37 (6B), p.L718
Main Authors: Minotani, Tadashi, Kawakami, Satoru, Kuroki, Yukinori, Enpuku, Keiji
Format: Article
Language:English
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Summary:In order to develop YBa 2 Cu 3 O 7-δ bicrystal junctions suitable for high-performance superconducting quantum interference device (SQUID), the relationship between the junction properties and the misorientation angle of the bicrystal substrate is studied experimentally. Misorientation angles of 24°, 27°, 30°, 33° and 36.8° are used, and the angular dependencies of junction resistance R s and critical current I o are investigated. It is shown that values of R s and I o approximately follow the relation I o R s 1.5 =const. in these junctions. The obtained results are analyzed in terms of the direct and resonant tunneling mechanisms. It is also shown that values of R s ≈10 Ω and I o ≈20 µA can be obtained rather reproducibly when we use the 30° junctions. The properties of this junction are very promising for the development of high-performance SQUID.
ISSN:0021-4922
1347-4065
DOI:10.1143/JJAP.37.L718