Effect of Time Reversal Symmetry Breaking on the Density of States in Small Superconducting Grains

Details Effect of Time Reversal Symmetry Breaking on the Density of States in Small Superconducting Grains Effect of Time Reversal Symmetry Breaking on the Density of States in Small Superconducting Grains

1999-12-13

arxiv.org/abs/cond-mat/9912216v1

Physics

Condensed Matter

4 pages, 1 eps figure

Scientific paper

10.1103/PhysRevLett.85.816

We show that in ultra-small superconducting grains any concentration of magnetic impurities or infinitely small orbital effect of magnetic field leads to destruction of the hard gap in the tunneling density of states. Instead, though exponentially suppressed at low energies, the tunneling density of states exhibits the ``soft gap'' behavior, vanishing linearly with excitation energy, as the energy approaches zero.

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