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

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arxiv 0907.3741 v3 pith:LY3KVRR2 submitted 2009-07-21 cond-mat.supr-con cond-mat.mtrl-sci

S. Lee , J. Jiang , J. D. Weiss , C. M. Folkman , C. W. Bark , C. Tarantini , A. Xu , D. Abraimov
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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
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classification cond-mat.supr-concond-mat.mtrl-sci
keywords fe1-xcoxbicrystalsboundariescriticalcupratesdensityfieldgrain
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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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