Weak-link behavior of grain boundaries in superconducting Ba(Fe1-xCox)2As2 bicrystals
S. Lee, J. Jiang, J. D. Weiss, C. M. Folkman, C. W. Bark, C., Tarantini, A. Xu, D. Abraimov, A. Polyanskii, C. T. Nelson, Y. Zhang, S. H., Baek, H. W. Jang, A. Yamamoto, F. Kametani, X. Q. Pan, E. E. Hellstrom, A., Gurevich, C. B. Eom, D. C. Larbalestier
TL;DR
This study reveals that grain boundaries in Ba(Fe1-xCox)2As2 superconductors act as weak links, similar to high-Tc cuprates, due to competing orders and unconventional pairing, despite high vortex pinning and irreversibility fields.
Contribution
It demonstrates that weak-link behavior at grain boundaries is a common feature in pnictide superconductors, expanding understanding of their vortex dynamics and grain boundary effects.
Findings
Critical current density across grain boundaries is strongly depressed.
Weak-link behavior is similar to high-Tc cuprates.
Grain boundary effects are linked to competing orders and pairing symmetry.
Abstract
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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