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. © 2006 The American Physical Society.
Publication Source (Journal or Book title)
Physical Review Letters
Vorontsov, A., & Vekhter, I. (2006). Nodal structure of quasi-two-dimensional superconductors probed by a magnetic field. Physical Review Letters, 96 (23) https://doi.org/10.1103/PhysRevLett.96.237001