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AC Dynamics and Metastability of a Flux-Line Lattice

W. Henderson·E. Y. Andrei·M. J. Higgins·S. Bhattacharya
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Abstract

We have measured the complex surface impedance of 2H-NbSe_2 in the mixed state over a wide range of magnetic field(0-2T) and frequency(10-3000MHz). A crossover between pinned and viscous dynamics of flux-lines is observed at a pinning frequency, $ω_p$. The measured $ω_p$ is compared to that predicted by a single-particle "washboard potential" model for the pinning interaction. When the flux lattice is prepared in an ordered state by zero-field cooling or by driving it with a large current, $ω_p$ is in good agreement with the predicted value. However, when it is prepared in a metastable disordered state by field cooling, $ω_p$ is nearly two orders of magnitude higher than expected indicating a complete break-down of the single-particle model.

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W. Henderson, E. Y. Andrei, M. J. Higgins, S. Bhattacharya. 1997-03-05. AC Dynamics and Metastability of a Flux-Line Lattice. https://doi.org/10.1103/physrevlett.80.381

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