Probing the limits of superconductivity

Details Probing the limits of superconductivity Probing the limits of superconductivity

2002-06-07

arxiv.org/abs/cond-mat/0206120v1

Physics

Condensed Matter

Superconductivity

13 page pdf file, figures included To be published in conference proceedings of SPIE 2002

Scientific paper

DC voltage versus current measurements of superconductors in a magnetic field are widely interpreted to imply that a phase transition occurs into a state of zero resistance. We show that the widely-used scaling function approach has a problem: Good data collapse occurs for a wide range of critical exponents and temperatures. This strongly suggests that agreement with scaling alone does not prove the existence of the phase transition. We discuss a criterion to determine if the scaling analysis is valid, and find that all of the data in the literature that we have analyzed fail to meet this criterion. Our data on YBCO films, and other data that we have analyzed, are more consistent with the occurrence of small but non-zero resistance at low temperature.

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