Anomalous flux-flow dynamics in layered type-II superconductors at low temperatures

Details Anomalous flux-flow dynamics in layered type-II superconductors at low temperatures Anomalous flux-flow dynamics in layered type-II superconductors at low temperatures

1996-09-18

arxiv.org/abs/cond-mat/9609173v2

Phys. Rev. Lett. 78, 2640 (1997)

Physics

Condensed Matter

4 pages, Revtex

Scientific paper

10.1103/PhysRevLett.78.2640

Low-temperature dissipation due to vortex motion in strongly anisotropic type-II superconductors with a moderate disorder ($\Delta^2/E_F \ll \hbar/\tau \ll \Delta$) 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 the class C defined recently by Atland and Zirnbauer [cond-mat/9602137], so the vortex motion leads naturally to the new example of a parametric statistics of energy levels. The flux-flow conductivity $\sigma_{xx}$ is a bit lower than the quasiclassical one and {\it grows} slowly with the increase of the electric field.

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