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The effect of nonmagnetic impurities on the local density of states in s-wave superconductors

P. Miranovic·M. Ichioka·K. Machida
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Abstract

We study the effect of nonmagnetic impurities on the local density of states (LDOS) in s-wave superconductors. The quasiclassical equations of superconductivity are solved selfconsistently to show how LDOS evolves with impurity concentration. The spatially averaged zero-energy LDOS is a linear function of magnetic induction in low fields, N(E=0)=cB/H_{c2}, for all impurity concentration. The constant of proportionality "c" depends weakly on the electron mean free path. We present numerical data for differential conductance and spatial profile of zero-energy LDOS which can help in estimating the mean free path through the LDOS measurement.

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P. Miranovic, M. Ichioka, K. Machida. 2003-12-17. The effect of nonmagnetic impurities on the local density of states in s-wave superconductors. https://doi.org/10.1103/physrevb.70.104510

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