Nodal structure of quasi-2D superconductors probed by magnetic field

Details Nodal structure of quasi-2D superconductors probed by magnetic field Nodal structure of quasi-2D superconductors probed by magnetic field

2006-01-06

arxiv.org/abs/cond-mat/0601126v1

Phys. Rev. Lett. v.96 p.237001 (2006)

Physics

Condensed Matter

Superconductivity

5 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.96.237001

We consider a quasi two-dimensional superconductor with line nodes in an in-plane magnetic field, and compute the dependence of the specific heat, $C$, and the in-plane heat conductivity, $\kappa$, on the angle between the field and the nodal direction in the vortex state. We use a variation of the microscopic Brandt-Pesch-Tewordt method that accounts for the scattering of quasiparticles off vortices, and analyze the signature of the nodes in $C$ and $\kappa$. At low to moderate fields the specific heat anisotropy changes sign with increasing temperature. Comparison with measurements of $C$ and $\kappa$ in CeCoIn$_5$ resolves the contradiction between the two in favor of the $d_{x^2-y^2}$ gap.

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