Physical Review B - CMMP

Stripes of increased diamagnetic susceptibility in underdoped superconducting Ba(Fe1-x Cox)2As2 single crystals: Evidence for an enhanced superfluid density at twin boundaries

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Superconducting quantum interference device microscopy shows stripes of increased diamagnetic susceptibility in the superconducting state of twinned, orthorhombic, underdoped crystals of Ba(Fe1-x Cox) 2As2, but not in tetragonal overdoped crystals. These stripes are consistent with enhanced superfluid density on twin boundaries. © 2010 The American Physical Society.