Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2.

  title={Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2.},
  author={Maria A Rotter and Marcus Tegel and Dirk Johrendt},
  journal={Physical review letters},
  volume={101 10},
The ternary iron arsenide BaFe2As2 becomes superconducting by hole doping, which was achieved by partial substitution of the barium site with potassium. We have discovered bulk superconductivity at T{c}=38 K in (Ba1-xKx)Fe2As2 with x approximately 0.4. The parent compound BaFe2As2 crystallizes in the tetragonal ThCr2Si2-type structure, which consists of (FeAs);{delta-} iron arsenide layers separated by Ba2+ ions. BaFe2As2 is a poor metal and exhibits a spin density wave anomaly at 140 K. By… Expand
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