Behavior of vortices near twin boundaries in underdoped Ba(Fe 1-xCox)2As2

B. Kalisky, J. R. Kirtley, J. G. Analytis, J. H. Chu, I. R. Fisher, K. A. Moler

Research output: Contribution to journalArticlepeer-review


We use scanning superconducting quantum interference device (SQUID) microscopy to investigate the behavior of vortices in the presence of twin boundaries in the pnictide superconductor Ba(Fe1-xCo x)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-xCo x)2As2. The observed repulsion from twin boundaries may be a mechanism for enhanced critical currents observed in twinned samples in pnictides and other superconductors.

Original languageEnglish
Article number064511
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number6
StatePublished - 11 Feb 2011
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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