Anomalous Flux-Flow Dynamics in Layered Type-II Superconductors at Low Temperatures

M. V. Feigel'man; M. A. Skvortsov

doi:10.1103/PhysRevLett.78.2640

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Anomalous Flux-Flow Dynamics in Layered Type-II Superconductors at Low Temperatures

M. V. Feigel'man, M. A. Skvortsov

DOI 10.1103/PhysRevLett.78.2640 · Physical Review Letters

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Abstract

Low-temperature dissipation due to vortex motion in strongly anisotropic type-II superconductors with a moderate disorder ( Δ2/EF≪ħ/τ≪Δ) is shown to be determined by the Zener-type transitions between the localized electronic states in the vortex core. Statistics of these levels is described by the random matrix ensemble of class C defined recently by Atland and Zirnbauer, so the vortex motion leads naturally to a new example of a parametric statistics of energy levels. The flux-flow conductivity σxx is a bit lower than the quasiclassical one and grows slowly with the increase of the electric field.