Abstract
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 givesH o =1.237 Oe for the 0 K critical field,T c =16.0 mK for the critical temperature, γ=1.008 mJ/mole · K2 for the coefficient of the electronic heat capacity, and Θ o =383 K for the 0 K Debye temperature. The measured values of the critical fieldH 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 ofH c suggest that both sets ofH 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-temperatureH c data obtained by BJW.
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Work supported by the U.S. Atomic Energy Commission.
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Triplett, B.B., Phillips, N.E., Thorp, T.L. et al. Critical field for superconductivity and low-temperature normal-state heat capacity of tungsten. J Low Temp Phys 12, 499–518 (1973). https://doi.org/10.1007/BF00654953
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DOI: https://doi.org/10.1007/BF00654953