Direct observation of stress accumulation and relaxation in small bundles of superconducting vortices in tungsten thin-films

Details Direct observation of stress accumulation and relaxation in small bundles of superconducting vortices in tungsten thin-films Direct observation of stress accumulation and relaxation in small bundles of superconducting vortices in tungsten thin-films

2011-01-12

arxiv.org/abs/1101.2297v1

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures, and 2 EPAPS figures

Scientific paper

We study the behavior of bundles of superconducting vortices when increasing the magnetic field using scanning tunneling microscopy and spectroscopy (STM/S) at 100 mK. Pinning centers are given by features on the surface corrugation. We find strong net vortex motion in a bundle towards a well defined direction. We observe continuos changes of the vortex arrangements, and identify small displacements, which stress and deform the vortex bundle, separated by larger re-arrangements or avalanches, which release accumulated stress.

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