Abstract
IT has frequently been suggested1 that supraconductivity is a phenomenon not due to the normal electrons which cause ordinary electrical conductivity, but that one may have to take into account supraconducting electrons as opposed to the ordinary electrons Such a hypothesis would seem to be in accord with the observed fact that there is no discontinuity in the heat-conductivity at the transition point2, In this case the following method would seem to enable one to determine the number of supraconducting electrons.
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References
W. Meissner, "Ergebn. exact. Naturwissenschaften", 11, 251.
W. J. de Haas, and H. Bremmer, Comm. Leiden, No. 214 d, 1931.
This thickness is, of course, the same as that which has been calculated independently for direct current by R. Becker, G. Heller, F. Sauter, Z. Phys., 85, 772; 1933. These authors, however, do not take into account the possible existence of normal electrons, which are of no interest for direct current problems but would be fundamental if they exist for the effect we are considering here. (Added in proof.) Therefore W. Braunbeck in a recently published paper (Z. Phys., 87, 470; 1934) obtains no production of heat calculating the propagation of electric waves through a supraconductor without considering the existence of normal electrons.
Dissertation Breslau
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LONDON, H. Production of Heat in Supraconductors by Alternating Currents. Nature 133, 497–498 (1934). https://doi.org/10.1038/133497b0
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DOI: https://doi.org/10.1038/133497b0
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