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Upper critical field of Nb and Nb+1 at % Ta determined by calorimetric and magnetic methods

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Abstract

The upper critical fieldH c2 of single-crystal Nb and arc-melted Nb+1 at % Ta near the critical temperatureT c has been measured using both calorimetric and magnetic methods. In contrast with theH c2 curve determined by the magnetic measurement, which shows a clear upward curvature, the calorimetric measurement gives a nearly straight line nearT c. The data disagree with available models. A possible explanation is given.

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Authors and Affiliations

  1. Institute of Physics, Chinese Academy of Sciences, Beijing, China

    Zhang Dianlin, Lin Shuyuan & C. -G. Cui

  2. University of Science and Technology of China, Hefei, China

    Chen Zhaojia

Authors
  1. Zhang Dianlin
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  2. Lin Shuyuan
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  3. C. -G. Cui
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  4. Chen Zhaojia
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Zhang, D., Lin, S., Cui, C.G. et al. Upper critical field of Nb and Nb+1 at % Ta determined by calorimetric and magnetic methods. J Low Temp Phys 55, 303–308 (1984). https://doi.org/10.1007/BF00683449

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  • DOI: https://doi.org/10.1007/BF00683449

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