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Non-Ohmic Normal State Behavior and the Onset of Global Superconductivity in Partially Annealed Quench–Condensed Films of Tin

Published online by Cambridge University Press:  28 February 2011

Carl A. Shiffman ,
Robert S. Markiewicz  and
Men Ho
Carl A. Shiffman
Affiliation:
Physics Department, Northeastern University, Boston MA
Robert S. Markiewicz
Affiliation:
Physics Department, Northeastern University, Boston MA
Men Ho
Affiliation:
Physics Department, Northeastern University, Boston MA
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Abstract

Films of tin condensed onto 4K pyrex substrates can be driven from “insulating” (i.e. dR/dT < 0) to superconducting behavior by low temperature annealing. Global superconductivity occurs when the normul state sheet resistance, R□, shrinks to a value very near R□ ≡ h/4ea, as in experiments where R□ is changed by increasing the film thickness. When R□ > R□, conduction is decidedly non-ohmic, with R□(T,V) = R□(T) + R1 (T)exp(−m(T)|V|).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 195: Symposium S – Physical Phenomena in Granular Materials , 1990 , 369
Copyright
Copyright © Materials Research Society 1990

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References

REFERENCES

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