Behavior of vortices near twin boundaries in underdoped Ba(Fe_1-xCo_x)₂As₂

2010/12/20 by B. Kalisky, J. R. Kirtley, J. G. Analytis +3 · 2 citations
Physics and Astronomy · #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevb.83.064511

arxiv created 2010/12/20 · arxiv updated 2015/05/20

Abstract

We use scanning SQUID microscopy to investigate the behavior of vortices in the presence of twin boundaries in the pnictide superconductor Ba(Fe1-xCox)2As2. We show that the vortices avoid pinning on twin boundaries. Individual vortices move in a preferential way when manipulated with the SQUID: they tend to not cross a twin boundary, but rather to move parallel to it. This behavior can be explained by the observation of enhanced superfluid density on twin boundaries in Ba(Fe1-xCox)2As2. The observed repulsion from twin boundaries may be a mechanism for enhanced critical currents observed in twinned samples in pnictides and other superconductors.

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• Vortex flow anisotropy in nematic superconductors
• Braiding of Majorana Zero Modes in Vortex Cores

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