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.
|Physical Review B - Condensed Matter and Materials Physics
|Published - 17 May 2010