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Weak link behavior of grain boundaries in Co-doped BaFe2As2 pnictide superconductors | | 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
; | | Date: |
21 Jul 2009 | | Abstract: | The discovery of any new high transition temperature Tc superconductor
immediately poses the question of whether it has the essential qualities for
applications: high critical current density Jc, high upper critical field Hc2
and irreversibility field Hirr, low anisotropy Hc2(ab)/Hc2(c) and capability of
grain boundaries (GBs) to transmit supercurrent. YBa2Cu3O7-x fulfills all
except the last requirement, resulting in more than 15 years of arduous
development of sophisticated crystallographic texture fabrication processes to
eliminate all but low angle GBs in useful conductor forms. In the recently
discovered pnictide superconductors, novel Cooper pairing mediated by magnetic
Fe ions leads to the second class of materials with Tc above 50 K. Here we show
that despite their low anisotropy (<2), strong vortex pinning and high
irreversibility field Hirr close to Hc2 which is well over 50 T, the critical
current density Jb across [001] tilt GBs of thin film Ba(Fe1-xCox)2As2
bicrystals is strongly depressed, exhibiting weak link GB behavior similar to
high-Tc cuprates. Our results suggest that weak-linked GBs are characteristic
of high-Tc superconducting compounds with competing orders, low carrier
density, and unconventional pairing symmetry and that GB properties require
much greater attention if application hopes for high-Tc materials are to be
fulfilled. | | Source: | arXiv, 0907.3741 | | Services: | Forum | Review | PDF | Favorites | |
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