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Linewidth of Relaxation Oscillations of a Shunted Superconducting Point Contact

  • R. D. Sandell
  • M. Puma
  • B. S. DeaverJr.

Abstract

When a superconducting weak link is shunted with a very small resistor and fed with a constant-current source the Josephson oscillation can be very nearly sinusoidal, corresponding to constant-voltage bias of the weak link. However, there is an inductance L o of the loop containing the weak link and the resistor. If L 00/2πi c where Φ0 is the flux quantum and i c the critical current, relaxation oscillations occur. These oscillations correspond roughly to the charging of L 0 to a current i≃ic followed by a sudden switch of some number N of flux quanta across the weak link, reducing the current to some lower value. We have observed the spectrum of these oscillations as a function of temperature and find that the character of the spectrum changes periodically with a period corresponding to ic(T)L00

Keywords

Critical Current Weak Link Relaxation Oscillation Flux Quantum Bias Voltage Versus 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

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Copyright information

© Springer Science+Business Media New York 1974

Authors and Affiliations

  • R. D. Sandell
    • 1
  • M. Puma
    • 1
  • B. S. DeaverJr.
    • 1
  1. 1.University of Virginia CharlottesvilleUSA

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