Plasma resonance in the response and in the rf impedance of a capacitively shunted Josephson junction in the presence of thermal noise

Journal Article · Sun Nov 30 23:00:00 EST 1980 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.327618· OSTI ID:6673987

Poorter, T; Tolner, H

The rf impedance and the wide-band response to radiation of a resistively shunted junction (RSJ) model Josephson junction have been measured in the presence of thermal noise, using a phase-locked-loop analog of the RSJ model. In the conditions for which analytical calculations are valid there is good agreement between the theory and the analog. When the RSJ model is shunted with a capacitance, a plasma type resonance can occur in the rf impedance when the junction is biased in the supercurrent (in-lock). When thermal noise is present, this plasma resonance can also occur when a nonzero average voltage is generated across the junction. We found that in this case a resonance also occurs in the wide-band response to radiation. This resonance takes place at a frequency that can be identified as the attempt frequency, with which the junction attempts to escape the phase locked condition in which it exists for a fraction of the time even though the average voltage across the junction is nonzero. The average lifetimes of the junction in lock tau/sub in/ (v-bar=0) and out of lock tau/sub out/ (v-bar=v-bar/sub out/) were also measured in the presence of thermal noise. tau/sub in/ is in good agreement with existing theory and tau/sub out/ is derived from the measurements.

• Research Organization: Kapteyn Astronomical Institute, Department of Space Research, University of Groningen, The Netherlands
• OSTI ID: 6673987
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Journal Issue: 12 Vol. 51:12; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

420201* -- Engineering-- Cryogenic Equipment & Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CAPACITORS
DATA
ELECTRICAL EQUIPMENT
ELECTRICAL PROPERTIES
EQUIPMENT
IMPEDANCE
INFORMATION
JOSEPHSON JUNCTIONS
JUNCTIONS
MATHEMATICAL MODELS
NOISE
PHYSICAL PROPERTIES
PLASMA
RADIATIONS
RESONANCE
SUPERCONDUCTING JUNCTIONS