Density of states of a type-II superconductor in a high magnetic field: Impurity effects

Abstract

We have calculated the density of states $N(\omega )$ of a dirty but homogeneous superconductor in a high magnetic field. We assume a dilute concentration of scalar impurities and find how $N(\omega )$ behaves as one crosses from the weak scattering to the strong scattering limit. At low energies, $N(\omega )\sim {\omega }^2$ for small values of the impurity concentration and scattering strength. When the disorder becomes stronger than some critical value, a finite density of states is created at the Fermi surface. These results are a consequence of the gapless nature of the quasiparticle excitation spectrum in a high magnetic field.

20 pages in RevTeX, 4 figures, to appear in Phys. Rev. B (July 1, 1997)

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