CHARACTERISTICS OF Y-BA-CU-O/NB AND BI-SR-CA-CU-O/NB TUNNEL-TYPE JOSEPHSON-JUNCTIONS
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概要
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We have fabricated Y-Ba-Cu-O/Nb and Bi-Sr-Ca-Cu-O/Nb tunnel-type Junctions and observed the DC and AC Josephson effects. Gold thin films were deposited for an inter-layer to protect the reaction between the base electrode and the tunnel oxide before the tunnel barrier formation. In Y-Ba-Cu-O/Au/MgOx/Nb junctions, superconducting current, hysteresis of current-voltage characteristics and the rf-induced voltage steps at the voltage as high as 0.13 mV in the current-voltage characteristics were observed. Moreover, the superconducting current has been modulated by the magnetic field. In Bi-Sr-Ca-Cu-O/Au/MgO(x)/Nb junctions, superconducting current and the rf-induced voltage steps at the voltage as high as 0.15 mV were also observed.
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