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Abstract: We observed slow moving vortex lattices in NbSe 2 using a home built STM at atemperature of 4.2 K and magnetic fields in the range of 250-500 mT. The vortexlattices move coherently at speeds of 1-10 pm-s due to a slow decay of ourmagnetic field of 0.5 mT-day. We observe collective speed variations whichindicate pinning-depinning events. Furthermore, we found - to our knowledgefor the first time - small and local deviations from the coherent behavior.Most noticeable were local lattice distortions with displacements of thevortices of ~2 nm from their ideal lattice position. We compared theobservations to a 2-D simulation of a vortex lattice moving under similarconditions and found similar distortion effects near pinning sites. Thus,studying the distortion patterns could lead to a better understanding of thevortex-defect interaction.

Author: Michael Dreyer, Jonghee Lee, Hui Wang, Barry Barker

Source: https://arxiv.org/

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