What is the highest precision achieved in the measure of the upper limit of the resistance of the superconducting phase (for any superconductor)?

  • $\begingroup$ Are you asking about instrument limitations or whether a superconductor is actually a superconductor? $\endgroup$ – honeste_vivere Feb 20 '16 at 15:34
  • $\begingroup$ The most accurate way (As far as I know) of measuring the resistance of a superconductor is in measuring the decay time of a persistent current in a superconducting ring (which is supposed to be infinite, but experimentally you cannot measure it for an infine time). I remember from some classes I had a couple years ago that the most precise measurement was done by letting a persistent current flow for something like an year, but I cannot find any reference, and the error they obtained. That's what I'm asking. $\endgroup$ – PhilipV Feb 20 '16 at 20:06
  • $\begingroup$ Ah okay, perhaps edit your question to clearly state that so that the reader knows precisely to what you refer. $\endgroup$ – honeste_vivere Feb 20 '16 at 20:09

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