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Measurements of the Maximum Josephson Supercurrent vs. Magnetic Field as a Probe of Tunnel Barrier Uniformity

  • A. Barone
  • G. Paternò
  • M. Russo
  • R. Vaglio
Part of the NATO Advanced Study Institutes Series book series (NSSB, volume 65)

Abstract

Nonequilibrium quasiparticle distributions can be studied as a result of elastic single-particle electron tunneling in superconducting junctions. The use of a tunnel junction both for creation and detection of nonequilibrium states is widely reported in the literature. Quasiparticle, phonon and photon generation by tunneling have been in fact investigated, as well as phonon, and microwave detection, etc. For instance, a simple symmetric (i.e., equal superconducting gaps Δ12=Δ) junction can be used in the voltage region V<2Δ/e for the detection of phonons of energy V1ω>2Δ (see Chapter 3). Another example is a structure consisting of two superimposed tunnel junctions with one superconducting layer in common (i.e., a S-I-S-I-S structure), which has been successfully employed in a variety of experiments of nonequilibrium superconductivity (see Chapter 5). In this case the role of the one junction is the creation of the nonequilibrium superconducting state, whereas the second serves as a probe of such a state. The possibility of phonon detection by using Josephson junctions has also been demonstrated (e.g., Tredwell and Jacobsen, 1974).

Keywords

Josephson Junction Tunnel Junction Background Current Magnetic Field Dependence Current Density Distribution 
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

© Plenum Press, New York 1981

Authors and Affiliations

  • A. Barone
    • 1
    • 2
  • G. Paternò
    • 3
  • M. Russo
    • 1
  • R. Vaglio
    • 4
  1. 1.Istituto di CiberneticaCNRArco FeliceItaly
  2. 2.Istituto di FisicaUniversitá di NapoliItaly
  3. 3.Laboratori NazionaliCNENFrascatiItaly
  4. 4.Istituto di FisicaUniversitá di Salerno ISalernoItaly

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