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We show that despite the low anisotropy, strong vortex pinning and highirreversibility field Hirr close to the upper critical field Hc2 ofBa(Fe1-xCox)2As2, the critical current density Jgb across [001] tilt grainboundaries (GBs) of thin film Ba(Fe1-xCox)2As2 bicrystals is stronglydepressed, similar to high-Tc cuprates. Our results suggest that weak-linkedGBs are characteristic of both cuprates and pnictides because of competingorders, low carrier density, and unconventional pairing symmetry.

Weak-link behavior of grain boundaries in superconducting Ba(Fe1-xCox)2As2 bicrystals