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.
@article{arxiv.0907.3741,
title = {Weak-link behavior of grain boundaries in superconducting Ba(Fe1-xCox)2As2 bicrystals},
author = {S. Lee and J. Jiang and J. D. Weiss and C. M. Folkman and C. W. Bark and C. Tarantini and A. Xu and D. Abraimov and A. Polyanskii and C. T. Nelson and Y. Zhang and S. H. Baek and H. W. Jang and A. Yamamoto and F. Kametani and X. Q. Pan and E. E. Hellstrom and A. Gurevich and C. B. Eom and D. C. Larbalestier},
journal= {arXiv preprint arXiv:0907.3741},
year = {2015}
}