STM Imaging of Flux Line Arrangements in the Peak Effect Regime

Details STM Imaging of Flux Line Arrangements in the Peak Effect Regime STM Imaging of Flux Line Arrangements in the Peak Effect Regime

2002-07-04

arxiv.org/abs/cond-mat/0207133v1

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures included Manuscript has been submitted

Scientific paper

10.1103/PhysRevLett.89.147006

We present the results of a study of vortex arrangements in the peak-effect regime of 2H-NbSe_2 by scanning tunneling microscopy. By slowly increasing the temperature in a constant magnetic field, we observed a sharp transition from collective vortex motion to positional fluctuations of individual vortices at the temperature which coincides with the onset of the peak effect in ac-susceptibility. We conclude that the peak effect is a disorder driven transition, with the pinning energy winning from the elastic energy.

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