Accession Number:

AD0271994

Title:

SUPERCONDUCTING PROPERTIES OF TIN, INDIUM AND MERCURY BELOW 1 DEGREE KELVIN

Descriptive Note:

Corporate Author:

ILLINOIS UNIV URBANA

Personal Author(s):

Report Date:

1961-12-01

Pagination or Media Count:

1.0

Abstract:

The critical field curves of superconducting Sn, In, and Hg were measured from T sub c to 0.3 K. The measurements extend to sufficiently low temperatures to reach the region where the superconducting state entropy is negligible compared to the normal state entropy. From measurements in this low temperature range, the normal electronic specific heat coefficient was determined. The superconducting entropy and specific heat derived from these data are presented. The data were compared with the BCS theory of Bardeen, Cooper, and Schrieffer Phys. Rev., 1081175, 1957 in two ways. In addition, comparison was made between the measured critical field curves and curves obtained by scaling the BCS energy gap by a constant factor. Reasonable values were obtained from the analysis but the full range of superconducting state behavior did not completely agree with theoretical predictions. Results of these critical field measurements were compared with calorimetric data for Sn and In with special emphasis on their implications for the specific heat anomaly in In recently reported. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE