AC Dynamics and Metastability of a Flux-Line Lattice

Details AC Dynamics and Metastability of a Flux-Line Lattice AC Dynamics and Metastability of a Flux-Line Lattice

1997-03-05

arxiv.org/abs/cond-mat/9703053v1

Phys. Rev. Lett. 80, 381, (1998)

Physics

Condensed Matter

4 Pages, ReVTeX, epsf, 4 postscript figures

Scientific paper

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, $\omega_p$. The measured $\omega_p$ 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, $\omega_p$ is in good agreement with the predicted value. However, when it is prepared in a metastable disordered state by field cooling, $\omega_p$ is nearly two orders of magnitude higher than expected indicating a complete break-down of the single-particle model.

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