Field dependence of the zero energy density of states around vortices in an anisotropic gap superconductor

Details Field dependence of the zero energy density of states around vortices in an anisotropic gap superconductor Field dependence of the zero energy density of states around vortices in an anisotropic gap superconductor

2004-03-23

arxiv.org/abs/cond-mat/0403589v1

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures. Submitted

Scientific paper

10.1103/PhysRevB.70.100503

It is shown theoretically that the Sommerfeld coefficient $\gamma(B)$ in the mixed state contains useful information on the gap topology in a superconductor. We accurately evaluate $\gamma(B)$ against magnetic induction $B$ by using microscopic quasi-classical theory. The linear portion in {$\gamma(\propto B)$} relative to $B_{\rm c2}$ and its slope in low field faithfully corresponds to the gap anisotropy, so that we can distinguish the nodal gap and the anisotropic full gap, and estimate the magnitude of the gap anisotropy.

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