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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

cond-mat.supr-conarXiv:cond-mat/0310775

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 γs(H) being a nonlinear function of magnetic field H. In the range of magnetic fields H (0.15-0.2)Hc2 where our theory is applicable, the calculated γs(H) closely resembles the experimental data for the borocarbide superconductor YNi2B2C.

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