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Paper detail

Behavior of vortices near twin boundaries in underdoped $Ba(Fe_{1-x}Co_{x})_{2}As_{2}$

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.

preprint2010arXivOpen access
B. KaliskyJ. R. KirtleyJ. G. AnalytisJ. -H. ChuI. R. FisherK. A. Moler
cond-mat.supr-con
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B. KaliskyJ. R. KirtleyJ. G. AnalytisJ. -H. ChuI. R. FisherK. A. Moler

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