The linewidth of Josephson radiation in shallow step YBCO junction

✍ Scribed by G.A. Ovsyannikov; J. Ramos; Z.G. Ivanov; G.M. Fischer; J. Mygind; T. Claeson; N.F. Pedersen; G. Daalmans

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 162 KB
• Volume: 235-240
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(94)91146-0

✦ Synopsis

DC and microwave properties of YBCO microbridges formed across a shallow step in MgO substrates were studied. Shallow steps, 2-5 nm high, were Ar ion beam etched with an angle of incidence of 60 ° in an MgO substrate. A 200 nm thick YBCO film was grown by pulsed laser deposition. The linewidth of the self Josephson radiation was measured by a technique based on the change of the current-voltage characteristics due to phase-locking of the Josephson oscillation to a small external microwave signal.