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

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

2003-10-31

arxiv.org/abs/cond-mat/0310775v1

Physical Review B 68, 174519 (2003)

Physics

Condensed Matter

Superconductivity

7 pages, 2 figures, to appear in Physical Review B

Scientific paper

10.1103/PhysRevB.68.174519

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 $\gamma_s(H)$ 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 $\gamma_s(H)$ closely resembles the experimental data for the borocarbide superconductor YNi$_2$B$_2$C.

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