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English

Mixed-State Specific Heat of the Type-II Superconductor Nb0.77Zr0.23 in Magnetic Fields up to Bc2

Published inJournal of Superconductivity, vol. 10, no. 5, p. 527-535
Collection
  • Open Access - Licence nationale Springer 
Publication date1997
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.

Citation (ISO format)
MIRMEFSTEIN, A. et al. Mixed-State Specific Heat of the Type-II Superconductor Nb<sub>0.77</sub>Zr<sub>0.23</sub> in Magnetic Fields up to B<sub>c2</sub>. In: Journal of Superconductivity, 1997, vol. 10, n° 5, p. 527–535. doi: 10.1007/BF02767690
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ISSN of the journal0896-1107
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