NDLI: Current-phase relation of high-T/sub c/ bicrystal and step-edge Josephson junctions

Content Provider	IEEE Xplore Digital Library
Author	Zakosarenko, V. Il'ichev, E.V. Usselsteijn, R.P.J. Schultze, V.
Copyright Year	2002
Abstract	The real and imaginary part of the rf impedance of a phase-biased weak link based on YBa/sub 2/Cu/sub 3/O/sub 7-x/ thin films were investigated experimentally at 77 K. The investigated weak links were step-edge or bicrystal Josephson junctions incorporated into a washer type superconducting ring with a small inductance L=80...300 pH. The ring was inductively coupled to a tank circuit with a resonant frequency of about 23 MHz. The phase shift /spl alpha/ between the rf voltage and rf current through the tank circuit was found to be a convenient measure of the change of inductance of a weak link. From the dependence of /spl alpha/ on the magnetic flux in the ring one can deduce the current-phase relation I(/spl phi/)=I/sub c/ f(/spl phi/) of the weak link. The influence of thermal noise on f(/spl phi/) was estimated numerically using a Gaussian distribution of the noise amplitude. The experimentally observed dependence /spl alpha/(/spl phi/) for the bicrystal weak link can be sufficiently good described with f(/spl phi/)=sin (/spl phi/) and with a reasonable value of the noise amplitude. The step-edge junction shows remarkable deviation from the sinusoidal current-phase relation.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	1057
Ending Page	1060
Page Count	4
File Size	464964
File Format	PDF
ISSN	10518223
Volume Number	7
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Noise level Superconducting device noise Josephson junctions Gaussian noise Magnetic noise Impedance Superconducting thin films Thin film circuits Inductance Coupling circuits
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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