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Title: Radiation from flux flow in Josephson junction structures.

Authors:
; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
926985
Report Number(s):
ANL/MSD/JA-56015
DOE Contract Number:
DE-AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: J. Superconduct. Novel Magn.; Journal Volume: 19; Journal Issue: 3-5 ; 2006
Country of Publication:
United States
Language:
ENGLISH

Citation Formats

Bulaevskii, L. N., Koshelev, A. E., Materials Science Division, and LANL. Radiation from flux flow in Josephson junction structures.. United States: N. p., 2006. Web.
Bulaevskii, L. N., Koshelev, A. E., Materials Science Division, & LANL. Radiation from flux flow in Josephson junction structures.. United States.
Bulaevskii, L. N., Koshelev, A. E., Materials Science Division, and LANL. Sun . "Radiation from flux flow in Josephson junction structures.". United States. doi:.
@article{osti_926985,
title = {Radiation from flux flow in Josephson junction structures.},
author = {Bulaevskii, L. N. and Koshelev, A. E. and Materials Science Division and LANL},
abstractNote = {},
doi = {},
journal = {J. Superconduct. Novel Magn.},
number = 3-5 ; 2006,
volume = 19,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}
  • A theoretical model for the radiation linewidth in a multifluxon state of a long Josephson junction is presented. Starting from a perturbed sine-Gordon model with a temperature-dependent noise term, we develop a collective coordinate approach which allows us to calculate the finite radiation linewidth due to excitation of the internal degrees of freedom in the moving fluxon chain. At low fluxon density, the radiation linewidth is expected to be substantially larger than that of a lumped Josephson oscillator. With increasing the fluxon density, a crossover to a much smaller linewidth corresponding to the lumped oscillator limit is predicted. {copyright} {italmore » 1996 The American Physical Society.}« less
  • We compute current-voltage characteristics of an array of resistively shunted Josephson junctions with screening effects treated self-consistently by introducing inductance coefficients. The flux distribution and flux motion through the system is analyzed in the presence of transport currents and of an external magnetic field. We also discuss the applicability of our model to describe inhomogeneous high-[ital T][sub [ital c]] superconductors.
  • Theoretical and experimental studies have been made of the effects of junction geometry on the performance of the flux-flow type Josephson oscillator. It is shown theoretically that the height and the slope of the current steps appearing in dc I-V curves of the junction, which determine the available power and the radiation linewidth of the oscillator, respectively, are dependent strongly upon self fields in the junction. In order to study the effects of junction geometries on the self fields, computer simulation and experiments have been carries out for an in-line junction, an overlap junction and an overlap junction with amore » small projection on one side. The best performance is obtained for the overlap junction with a moderate projection on side as expected theoretically.« less
  • We carry out equilibrium and steady-state simulations of a periodic square Josephson-junction array in the presence of a transverse magnetic field giving a uniform frustration of {ital f}=2/5. We find a first-order transition to the low-temperature superconducting phase. Linear resistivity above {Tc} and nonlinear resistivity below {ital T}{sub {ital c}} are interpreted in terms of vortex fluctuations.
  • In order to study the various aspects associated with flux flow in a large Josephson junction, a new equation which describes a balance of net forces acting on each vortex has been derived by a spatial average of the two-dimensional Josephson equation. This equation reveals the existence of two kinds of driving forces, i.e., a driving force due to density gradients of vortices and that due to a line tension of a vortex, and also the existence of two kinds of counterforces, i.e., a viscous drag force due to a normal current and an inertial force due to a junctionmore » capacitance. It is shown by this equation that there exist two propagation modes of envelope waves in a large Josephson junction in a flux-flow state. An analytical expression for flux-flow conductance is also obtained using this equation, which is in reasonable agreement with experimental results.« less