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Studies in Superconductivity II. Evaporated Lead Films

W. F. Brucksch, Jr.* and Waldemar T. Ziegler

  • Cryogenic Laboratory, Department of Chemistry, The Johns Hopkins University, Baltimore, Maryland

  • *Present address: U. S. Rubber Company, Detroit, Michigan.
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Phys. Rev. 62, 348 – Published 1 October, 1942

DOI: https://doi.org/10.1103/PhysRev.62.348

Abstract

The electrical and magnetic properties of evaporated lead films of several thicknesses (1000-3000A) have been studied in the superconducting state. The films exhibited transition temperatures (in zero magnetic field) of 7.23±0.03°K irrespective of thickness. The disappearance of resistance (99 to 1 percent) usually occurred within a range of 0.10°. The depression of the transition temperature with increase in measuring current Ic was found to be greater the thinner the film, all films showing larger depressions than a 254-micron lead wire (Tc=7.20°K). The depression of the transition temperature in several magnetic fields (0-80 oersteds) perpendicular to the plane of the film was found to depend upon thickness, the thinner films requiring larger external fields to produce a unit depression. The Ic versus Tc curves obtained exhibit inflection points not heretofore observed, while the Hc versus Tc curves obtained suggest the existence of a similar phenomenon. The effect of measuring current on the depression of the transition temperature in constant magnetic fields also has been studied.

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References (21)

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  10. Omitted endnote

  11. Omitted endnote

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  15. Omitted endnote

  16. R. Suhrman and H. Schnackenberg, Zeits. f. Elektrochemie 47, 277 (1941)
  17. Appleyard, Bristow, London, and Misener, Proc. Roy. Soc. A172, 540 (1939) Nature 142, 74 (1938))
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  21. Onnes, Leiden Comm. b219, 13 (1932)

Outline

Information

Phys. Rev. 62, 348– Published 1 October, 1942
  • Received 29 June 1942

© 1942 American Physical Society

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