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Proceedings Paper

Probing the limits of superconductivity
Author(s): Douglas R. Strachan; Matthew C. Sullivan; Christopher J. Lobb
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Paper Abstract

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.

Paper Details

Date Published: 7 November 2002
PDF: 13 pages
Proc. SPIE 4811, Superconducting and Related Oxides: Physics and Nanoengineering V, (7 November 2002); doi: 10.1117/12.452479
Show Author Affiliations
Douglas R. Strachan, Univ. of Maryland/College Park (United States)
Matthew C. Sullivan, Univ. of Maryland/College Park (United States)
Christopher J. Lobb, Univ. of Maryland/College Park (United States)

Published in SPIE Proceedings Vol. 4811:
Superconducting and Related Oxides: Physics and Nanoengineering V
Ivan Bozovic; Davor Pavuna, Editor(s)

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