Abstract
SEVERAL, experiments have been carried out to check whether the resistance of a bulk metal in the superconducting state is truly zero. The best known is that carried out by Collins1, in which a persistent current of several hundred amperes was maintained in a lead ring for two and a half years. At the end of this time there was no measurable decrease in the magnitude of the current. The resistance of the ring is quoted by Crowe1 as less than 10−21 ohm, but no figure for the resistivity of the lead is given.
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References
Quoted by Crowe, J. W., I.B.M. J. Res. and Development, 1, 294 (1957).
Kronick, H. E., I.B.M.J. Res. and Development, 2, 252 (1958).
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BROOM, R. An Upper limit for the Resistivity of a Superconducting Film. Nature 190, 992–993 (1961). https://doi.org/10.1038/190992b0
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DOI: https://doi.org/10.1038/190992b0
