Physics – Condensed Matter – Superconductivity
Scientific paper
2010-02-01
Phys. Rev. B 81, 094527 (2010)
Physics
Condensed Matter
Superconductivity
10 pages, 9 figures
Scientific paper
10.1103/PhysRevB.81.094527
We analyse the combined effect of orbital and Pauli depairing on the superconducting state, and apply the results to the heavy fermion CeCoIn$_5$. We find that: a) standard extrapolation based on the slope of $H_{c2}(T)$ in the vicinity of the transition temperature to T=0 does not always give accurate values of the orbital upper critical field; b) critical value of the Maki parameter, $\alpha$, that determines onset of the first order transition depends on the Fermi surface shape and the symmetry of the gap, and is $\alpha^*\approx 3$ for CeCoIn$_5$; c) the anisotropy of the thermodynamic and transport coefficients in the low-temperature, low-field part of the phase diagram is essentially insensitive to the Zeeman field and can be used to determine the nodal directions in Pauli-limited superconductors. The latter result confirms the finding of the $d_{x^2-y^2}$ order parameter CeCoIn$_5$.
Vekhter Ilya
Vorontsov Anton B.
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