Lifshitz Tail in the Density of States of a Superconductor with Magnetic Impurities
A. V. Balatsky, S. A. Trugman
DOI 10.1103/PhysRevLett.79.3767 · Physical Review Letters
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Abstract
We argue that any superconductor with magnetic impurities is gapless due to a Lifshitz tail in the density of states extending to zero energy. At low energy the density of states ν(E→0) remains finite. We show that fluctuations in the impurity distribution produce regions of suppressed superconductivity, which are responsible for the low energy density of states.
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