CRITICAL FIELD FOR SUPERCONDUCTIVITY AND LOW-TEMPERATURE NORMAL-STATE HEAT CAPACITY OF TUNGSTEN [electronic resource].

Published:: Berkeley, Calif. : Lawrence Berkeley National Laboratory, 1973.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:: 39 pages : digital, PDF file
Additional Creators:: Lawrence Berkeley National Laboratory and United States. Department of Energy. Office of Scientific and Technical Information

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Summary:

We have measured the critical magnetic field for superconductivity In tungsten from 5.5 to 15 mK using a γ-ray anisotropy thermometer, and we have measured the heat capacity between 0.35 and 25 K. Analysis of the data gives H₀ = 1.237 Oe for the 0 K critical field, T{sub c} = 16.0 mK for the critical temperature, γ = 1.008 mJ/mole K² for the coefficient of the electronic heat capacity, and Θ₀ = 383 K for the 0 K Debye temperature. The measured values of the critical field H{sub c} are consistently higher than those reported by Black, Johnson and Wheatley (BJW) on the CMN temperature scale, but the temperature dependence is similar. This discrepancy and the temperature dependence of H{sub c} suggest that both sets of H{sub c} data are affected by magnetic impurities. Use of the calorimetric γ value permits an improved test of the CMN temperature scale with the very low temperature H{sub c} data obtained by BJW.

Report Numbers:

E 1.99:lbl-1497
lbl-1497

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Note:

Published through SciTech Connect.
03/01/1973.
"lbl-1497"
Journal of Low Temperature Physics ISSN 0022-2291; JLTPAC FT
Brewer, W.D.; Shirley, D.A.; Phillips, N.E.; Triplett, B.B.; Thorp, T.L.
Chemical Sciences Division

Funding Information:

DE-AC02-05CH11231

View MARC record | catkey: 14359410