Unconventional superconductors under rotating magnetic field II: thermal transport

Details Unconventional superconductors under rotating magnetic field II: thermal transport Unconventional superconductors under rotating magnetic field II: thermal transport

2007-02-08

arxiv.org/abs/cond-mat/0702226v1

Phys. Rev. B 75, 224502 (2007)

Physics

Condensed Matter

Superconductivity

17 pages, 13 figures

Scientific paper

10.1103/PhysRevB.75.224502

We present a microscopic approach to the calculations of thermal conductivity in unconventional superconductors for a wide range of temperatures and magnetic fields. Our work employs the non-equilibrium Keldysh formulation of the quasiclassical theory. We solve the transport equations using a variation of the Brandt-Pesch-Tewordt (BPT) method, that accounts for the quasiparticle scattering on vortices. We focus on the dependence of the thermal conductivity on the direction of the field with the respect to the nodes of the order parameter, and discuss it in the context of experiments aiming to determine the shape of the gap from such anisotropy measurements. We consider quasi-two dimensional Fermi surfaces with vertical line nodes and use our analysis to establish the location of gap nodes in heavy fermion CeCoIn$_5$ and organic superconductor $\kappa$-(BEDT-TTF)$_2$Cu(NCS)$_2$.

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