Plastic Motion of a Flux-line Lattice Driven by Alternating Current

Details Plastic Motion of a Flux-line Lattice Driven by Alternating Current Plastic Motion of a Flux-line Lattice Driven by Alternating Current

1998-05-01

arxiv.org/abs/cond-mat/9805014v1

Phys. Rev. Lett. 81, 2352, (1998)

Physics

Condensed Matter

Superconductivity

5 pages, 4 figuress

Scientific paper

10.1103/PhysRevLett.81.2352

We have measured the response of the flux-line lattice in the low T$_c$ superconductor, 2H-NbSe$_2$, to finite frequency drives. In a well-defined range of fields, temperatures, and driving amplitudes the system exhibits a variety of novel non-linear phenomena. Most strikingly, the flux-lines can move easily in response to currents that are significantly lower than the DC critical current if the direction of the current is reversed periodically while the amplitude, I, is kept fixed, but they do not respond to a current that periodically switches between zero and I, while the direction is kept fixed. Pronounced memory effects associated with these phenomena indicate the presence of dynamically generated structural changes in the flux lattice.

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