An experimental and theoretical study of the relation between magnetic field and current in a superconductor
10.1098/rspa.1953.0040
Crossref journal-article
The Royal Society
Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences (175)
Abstract

The penetration depth, λ, in superconducting tin at 0° K has been found to be capable of variation by the addition of impurity, 3% of indium causing it to be nearly doubled, although the thermodynamical properties such as T c are hardly affected. It is suggested that this result throws doubt on the phenomenological theory of F. and H. London, and a new equation for the supercurrent is proposed, in which the current is related to an average of the vector potential over a region around the point considered. The size of the region is governed by a parameter ξ, which is dependent, in a similar way to the mean free path in a normal metal, on the degree of purity . The new theory agrees in a satisfactory manner with the experimental results, and also provides an explanation of the magnitude of λ in a pure metal. It has been found that the unusual anisotropy of λ in pure tin is absent in tin + 3 % indium , and this too is in agreement with the prediction of the new theory. The fact that the temperature variation of λ appears to have the same form independent of the degree of purity implies that ξ depends on temperature in the same way as λ; this result agrees with the observed behaviour of the interphase surface energy, α ns , if ξ is regarded as determining the width of the interface between superconducting and normal regions. The paper ends with a discussion of the relation of the new theory to microscopic theories of superconductivity.

Bibliography

An experimental and theoretical study of the relation between magnetic field and current in a superconductor. (1953). Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 216(1127), 547–568.

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Dates
Type When
Created 18 years, 8 months ago (Dec. 15, 2006, 5:03 p.m.)
Deposited 4 years, 6 months ago (Feb. 21, 2021, 12:31 a.m.)
Indexed 1 month, 2 weeks ago (July 2, 2025, 3:28 p.m.)
Issued 72 years, 5 months ago (Feb. 24, 1953)
Published 72 years, 5 months ago (Feb. 24, 1953)
Published Online 28 years, 7 months ago (Jan. 1, 1997)
Published Print 72 years, 5 months ago (Feb. 24, 1953)
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@article{1953, volume={216}, ISSN={2053-9169}, url={http://dx.doi.org/10.1098/rspa.1953.0040}, DOI={10.1098/rspa.1953.0040}, number={1127}, journal={Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences}, publisher={The Royal Society}, year={1953}, month=feb, pages={547–568} }