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

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

2009-07-21

arxiv.org/abs/0907.3741v3

Appl. Phys. Lett. 95, 212505 (2009)

Physics

Condensed Matter

Superconductivity

To appear in Applied Physics Letters

Scientific paper

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

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