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Critical field for superconductivity and low-temperature normal-state heat capacity of tungsten

Critical field for superconductivity and low-temperature normal-state heat capacity of tungsten 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 · K 2 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Low Temperature Physics Springer Journals

Critical field for superconductivity and low-temperature normal-state heat capacity of tungsten

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References (38)

Publisher
Springer Journals
Copyright
Copyright
Subject
Physics; Condensed Matter Physics; Characterization and Evaluation of Materials; Magnetism, Magnetic Materials
ISSN
0022-2291
eISSN
1573-7357
DOI
10.1007/BF00654953
Publisher site
See Article on Publisher Site

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 · K 2 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.

Journal

Journal of Low Temperature PhysicsSpringer Journals

Published: Nov 2, 2004

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