Enhanced superfluid density on twin boundaries in Ba(Fe1-xCox)2As2

Details Enhanced superfluid density on twin boundaries in Ba(Fe1-xCox)2As2 Enhanced superfluid density on twin boundaries in Ba(Fe1-xCox)2As2

2009-06-29

arxiv.org/abs/0906.5184v2

Physics

Condensed Matter

Superconductivity

16 pages, 4 figures

Scientific paper

Superconducting quantum interference device (SQUID) microscopy shows stripes of increased diamagnetic susceptibility in underdoped, but not overdoped, single crystals of Ba(Fe1-xCox)2As2. These stripes of increased diamagnetic susceptibility are consistent with enhanced superfluid density on twin boundaries. Individual vortices avoid pinning on or crossing the stripes, and prefer to travel parallel to them. These results indicate a relationship between superfluid density, local strain, and frustrated magnetism, and demonstrate two mechanisms for enhancing critical currents.

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