Nodal Structure of Quasi-Two-Dimensional Superconductors Probed by a Magnetic Field

A. Vorontsov; I. Vekhter

doi:10.1103/PhysRevLett.96.237001

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Nodal Structure of Quasi-Two-Dimensional Superconductors Probed by a Magnetic Field

A. Vorontsov, I. Vekhter

DOI 10.1103/PhysRevLett.96.237001 · Physical Review Letters

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Abstract

We consider a quasi-two-dimensional superconductor with line nodes in the presence of an in-plane magnetic field, and compute the dependence of the specific heat C and the in-plane heat conductivity κ 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 κ. At low to moderate fields the specific heat anisotropy changes sign with increasing temperature. Comparison with measurements of C and κ in CeCoIn5 resolves the contradiction between the two in favor of the dx2−y2 gap.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
CeCoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
CeCoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown