Effect of a magnetic field on the specific heat jump of a superconducting alloy containing paramagnetic impurities with local states within the gap |
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Authors: | Bahadur Sihota A D S Nagi |
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Affiliation: | 1. (GWP), Waterloo Campus, University of Waterloo, Waterloo, Ontario, Canada
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Abstract: | The effect of a uniform magnetic field on the specific heat jump \({\Delta C}\) of a superconductor containing paramagnetic impurities has been investigated. The impurities are described by the Shiba-Rusinov model. Taking the normalized position of the bound state within the BCS gap ε0=0.8 and 0.0 and the parameter α(=〈S z 2 〉/S2)=1.0 and 1/3 as typical values, we find the detailed dependence of \({\Delta C}\) on the impurity concentration \(\bar c\) and the transition temperature Tc. In some cases \({\Delta C}\) diverges at certain values of \(\bar c\) or Tc, signaling a change of the normal-superconductor phase transition from second order to first order. |
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