Quasiparticle Thermal Conductivities in a Type-II Superconductor at High Magnetic Field

Details Quasiparticle Thermal Conductivities in a Type-II Superconductor at High Magnetic Field Quasiparticle Thermal Conductivities in a Type-II Superconductor at High Magnetic Field

2002-04-18

arxiv.org/abs/cond-mat/0204414v1

Physical Review B 66, 014517 (2002)

Physics

Condensed Matter

Superconductivity

8 pages +1 ps figure included in text, to appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.66.014517

We present a calculation of the quasiparticle contribution to the longitudinal thermal conductivities as well as transverse (Hall) thermal conductivity of an extreme type-II superconductor in a high magnetic field and at low temperatures. In the limit of frequency and temperature approaching zero, both longitudinal and transverse conductivities upon entering the superconducting state undergo a reduction from their respective normal state values by the factor $(\Gamma /\Delta)^2$, which measures the size of the region at the Fermi surface containing gapless quasiparticle excitations. We use our theory to numerically compute the longitudinal transport coefficient in borocarbide and A-15 superconductors. The agreement with recent experimental data on LuNi_2B_2C is very good.

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