High intergrain critical current density in fine-grain (Ba0.6K0.4)Fe2As2 wires and bulks.

@article{Weiss2012HighIC,
  title={High intergrain critical current density in fine-grain (Ba0.6K0.4)Fe2As2 wires and bulks.},
  author={Jeremy D Weiss and Chiara Tarantini and J Jiang and Fumitake Kametani and Anatolii Polyanskii and David C. Larbalestier and Eric E. Hellstrom},
  journal={Nature materials},
  year={2012},
  volume={11 8},
  pages={
          682-5
        }
}
The K- and Co-doped BaFe(2)As(2) (Ba-122) superconducting compounds are potentially useful for applications because they have upper critical fields (H(c2)) of well over 50 T, H(c2) anisotropy γ < 2and thin-film critical current densities J(c) exceeding 1 MA cm(-2) (refs 1-4) at 4.2 K. However, thin-film bicrystals of Co-doped Ba-122 clearly exhibit weak link behaviour for [001] tilt misorientations of more than about 5°, suggesting that textured substrates would be needed for applications, as… 
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References

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Enhanced critical current properties in Ba0.6K0.4+xFe2As2 superconductor by overdoping of potassium
Phase-pure polycrystalline Ba0.6K0.4+xFe2As2 with 0≤x≤0.1 were prepared using a one-step solid-state reaction method. We found that overdoping of potassium can improve the critical current density
Significant enhancement of upper critical fields by doping and strain in iron-based superconductors
We report measurements up to 85 Tesla of the upper critical fields H(c2)(T) on Ba(1-x)K(x)As(2)Fe(2) single crystals and FeSe(1-x)Te(x) films tuned by doping and strain. We observed an H(c2)
Template engineering of Co-doped BaFe2As2 single-crystal thin films.
TLDR
New template engineering using single-crystal intermediate layers of SrTiO (3) and BaTiO(3) grown on various perovskite substrates that enables genuine epitaxial films of Co-doped BaFe (2)As(2) with a high transition temperature and strong c-axis flux pinning is reported.
Critical properties of a dense polycrystalline (Ba, K)Fe2As2 superconductor prepared by a combined process of melting and deformation
We report the synthesis of a polycrystalline bulk (Ba, K)Fe2As2 superconductor by a combined process of melting and deformation. The sample has fewer impurity phases and a higher density compared to
Biaxially textured cobalt-doped BaFe2As2 films with high critical current density over 1 MA/cm2 on MgO-buffered metal-tape flexible substrates
High critical current densities (Jc)>1 MA/cm2 were realized in cobalt-doped BaFe2As2 (BaFe2As2:Co) films on flexible metal substrates with biaxially textured MgO base-layers fabricated by an ion-beam
Weak-link behavior of grain boundaries in superconducting Ba(Fe1−xCox)2As2 bicrystals
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
Low-temperature synthesis of SmFeAsO0.7F0.3 − δ wires with a high transport critical current density
Ag-sheathed SmFeAsO0.7F0.3 − δ (Sm-1111) superconducting wires were prepared by a one-step solid state reaction at temperatures as low as 850–900 °C, instead of commonly used temperatures of
High transport critical current densities in textured Fe-sheathed Sr1−xKxFe2As2+Sn superconducting tapes
We report the realization of grain alignment in Sn-added Sr1−xKxFe2As2 superconducting tapes with Fe sheath prepared by ex-situ powder-in-tube method. At 4.2 K, high transport critical current
Very strong intrinsic flux pinning and vortex avalanches in (Ba,K)Fe2As2 superconducting single crystals
We report that the (Ba,K)Fe2As2 crystal with Tc =3 2 K shows a pinning potential, U0, as high as 104 K, with U0 showing very little field dependence. The (Ba,K)Fe2As2 single crystals become isotropic
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