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Influence of surface losses and the self-pumping effect on current-voltage characteristics of a long Josephson junction

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Authors:
  • Pankratov, A.L. ;
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    Department of Physics, Technical University of Denmark
  • Sobolev, A.S. ;
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    Department of Physics, Technical University of Denmark
  • Koshelets, V.P. ;
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    unknown
  • Mygind, Jesper
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    Orcid logo0000-0003-1464-7553
    Department of Physics, Technical University of Denmark
DOI:
10.1103/physrevb.75.184516
Abstract:
We have numerically investigated the dynamics of a long linear Josephson tunnel junction with overlap geometry. Biased by a direct current (dc) and an applied dc magnetic field, the junction has important applications as tunable high frequency oscillator [flux-flow oscillator (FFO)] in the millimeter and submillimeter range. The study is performed in the frame of a modified sine-Gordon model, which includes surface losses, self-pumping effect, and in an empirical way the superconducting gap. The electromagnetic coupling to the environment is modeled by a simple resistor-capacitor load (RC load) placed at both ends of the FFO. In our model, the damping parameter depends both on the spatial coordinate and on the amplitude of the ac voltage. In order to find the dc current-voltage curves, the damping parameter has to be calculated self-consistently by successive approximations and time integration of the perturbed sine-Gordon equation. The modified model gives better qualitative agreement with experimental results than the conventional perturbed sine-Gordon model.
Type:
Journal article
Language:
English
Published in:
Physical Review B Condensed Matter, 2007, Vol 75, Issue 18
Keywords:
FLUX-FLOW OSCILLATORS; RADIATION LINEWIDTH; PHASE-LOCKING; MILLIMETER; SUPERCONDUCTING INTEGRATED RECEIVER; SUBMILLIMETER WAVE REGION; MICROWAVE FIELDS
Main Research Area:
Science/technology
Publication Status:
Published
Review type:
Peer Review
Submission year:
2007
Scientific Level:
Scientific
ID:
108155310

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