Abstract
In simultaneous magneto-optical and electrical measurements on constricted type I superconducting films we have correlated step structure in the currentvoltage characteristic with the nucleation of individual flux-tube trains. A central feature of this experiment is the development of a sample geometry with which we can restrict the breakdown behavior to a single, localized flux-tube train running perpendicular to the transport current. Apparently, the step structure in the I–V characteristic results from a Gibbs free-energy barrier against the nucleation of flux-tube trains. The experiments are performed with films of lead and indium. From the I–V characteristics of the indium constrictions we conclude that the flux-tube nucleation rate can vary substantially with applied current beyond a voltage step at temperatures near T c.
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Based on work performed under the auspices of the U.S. Energy Research and Development Administration.
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Chimenti, D.E., Watson, H.L. & Huebener, R.P. Current-induced breakdown of superconductivity in constricted type I superconducting films. J Low Temp Phys 23, 303–318 (1976). https://doi.org/10.1007/BF00116922
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DOI: https://doi.org/10.1007/BF00116922