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Low-Temperature Specific Heat of an Extreme-Type-II Superconductor at High Magnetic Fields

A. L. Carr·J. J. Trafton·S. Dukan·Z. Tesanovic
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Abstract

We present a detailed study of the quasiparticle contribution to the low-temperature specific heat of an extreme type-II superconductor at high magnetic fields. Within a T-matrix approximation for the self-energies in the mixed state of a homogeneous superconductor, the electronic specific heat is a linear function of temperature with a linear-$T$ coefficient $γ_s(H)$ being a nonlinear function of magnetic field $H$. In the range of magnetic fields $H\agt (0.15-0.2)H_{c2}$ where our theory is applicable, the calculated $γ_s(H)$ closely resembles the experimental data for the borocarbide superconductor YNi$_2$B$_2$C.

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A. L. Carr, J. J. Trafton, S. Dukan, Z. Tesanovic. 2003-10-31. Low-Temperature Specific Heat of an Extreme-Type-II Superconductor at High Magnetic Fields. https://doi.org/10.1103/physrevb.68.174519

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