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Mixed-State Specific Heat of the Type-II Superconductor Nb0.77Zr0.23 in Magnetic Fields up toB c2

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Abstract

In order to document the behavior of the mean-field mixed-state specific heat of an isotropic. strongly type-II superconductor (i.e., with a large value of the Ginzburg parameterk), and to provide a basis for comparison with high-temperature superconductors, we measured the specific heatC of the alloy Nb0.77Zr0.23 withT c = 10.8K, B c2 (0) = 7.9T, in magnetic fieldsB = 0, 0.2, 1.0, 12, 2.0, 2.4. 3.0, 3.3. 4.0. 4.4, 4.8, 5.2, 6.0. 6.6, 7.2 and 10 T. The values of the upper critical fieldB c2 ( T), thermodynamic critical fieldB c (T), Ginzburg parameterk(T), and coefficient γ(B) = limT0(C(T. B)/T) are derived from the specific heat data and found to be in agreement with the GLAG theory in the dirty limit. The behavior of the mixed-state specific heat is analyzed in terms ofC el /T,∂(C el /T)/∂B, and∂(C el /T)/∂T vs. Tcurves, whereC el is the electronic contribution to the specific heat.

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Author notes

  1. A. Mirmefstein

    Present address: Institute for Metal Physics, Russian Academy of Sciences, 620219, Ekaterinburg, Russia

  2. J. Y. Genoud

    Present address: Industrial Research Limited, Gracefield Research Center, Material Physics, PO Box 31-310, Lower Hutt, New Zealand

Authors and Affiliations

  1. Département de Physique de la Matière Condens’ee, Université de Geneve, CH-1211 Genève 4, Switzerland

    A. Mirmefstein, A. junod, E. Walker, B. Revaz, J. Y. Genoud & G. Triscone

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  1. A. Mirmefstein
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  2. A. junod
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  3. E. Walker
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  4. B. Revaz
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  5. J. Y. Genoud
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  6. G. Triscone
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Mirmefstein, A., junod, A., Walker, E. et al. Mixed-State Specific Heat of the Type-II Superconductor Nb0.77Zr0.23 in Magnetic Fields up toB c2 . J Supercond 10, 527–535 (1997). https://doi.org/10.1007/BF02767690

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