Jpn. J. Appl. Phys. 30 (1991) pp. 3907-3910 |Next Article| |Table of Contents|
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Microwave Heterodyne Mixing by Step-Edge Microbridge Josephson Junctions Using YBaCuO Thin Films
Superconducting & Cryogenic Technology Center, Kobe Steel, Ltd., 5-5 Takatsukadai 1-chome, Nishi-ku, Kobe, HYOGO 651-22
(Received September 6, 1991; accepted for publication October 19, 1991)
Current-voltage characteristics and microwave mixing properties of step-edge microbridge Josephson junctions (SEJJs) made of YBaCuO thin films were systematically investigated. The step-edge was formed on the surface of a MgO(100) substrate employing the common photolithograph and wet-etching techniques. YBaCuO thin film was deposited by the off-axis sputtering method, and the microbridge junctions were fabricated so as to cross the step-edge. The SEJJs showed typical DC and AC characteristics which were explained by the resistively shunted junction (RSJ) model. Mixing experiments were carried out in the K-band microwave region. An intermediate frequency (IF) output with the frequency range of 20 MHz∼2.0 GHz was successfully obtained.
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