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

  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},
  volume={11 8},
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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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
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Template engineering of Co-doped BaFe2As2 single-crystal thin films.
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.
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