Unstable Behaviour of a Superconducting Ring Containing a Josephson Junction

  • A. Extremera
Part of the NATO ASI Series book series (NSSB, volume 218)


The dynamic decay process for a SQUID ring is analyzed within the framework of the flux mode regime. Under the equilibrium flux condition, the quantum rates for the low-lying states are computed by using a simpler form for the Anderson-Josephson potential This condensed matter model has acquired some fame since it describes collective quantum effects in thin magnetic films1 and sine-Gordon systems2. Functional integral techniques specifically adapted to the general features of superconductivity3 are used to derive WKB-type expansions. Hence, the probability in the dual charge (“momentum”) mode is easily obtained.


Path Integral JOSEPHSON Junction Flux Condition Quantum Tunnelling Magnetic Film 
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  1. 1.
    A. O. Caldeira and K. Furuya, Quantum nucleation of magnetic bubbles in a two-dimensional anisotropic Heisenberg model, J. Phys. C21:1227 (1988).ADSGoogle Scholar
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    K. Furuya and A. O. Caldeira, Quantum tunnelling in a double sine-Gordon system near the instability, Physica A154:289 (1989).ADSGoogle Scholar
  3. 3.
    A. Tagliacozzo and F. Ventriglia, Ordinary superconductivity and path integrals, Nuovo Cimento D11:141 (1989).ADSCrossRefGoogle Scholar

Copyright information

© Plenum Press, New York 1990

Authors and Affiliations

  • A. Extremera
    • 1
  1. 1.Departamento de Física ModernaUniversidad de GranadaGranadaSpain

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