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Doping improves performance : Iron arsenides (Ba 1− x  K  x  )Fe 2 As 2  with the ThCr 2 Si 2 ‐type structure exhibit superconductivity at 3–38 K depending on the potassium doping level. Superconductivity occurs before the structural distortion of the parent compound BaFe 2 As 2  ( x =0) is completely suppressed by doping (see phase diagram; • critical temperature, ○ phase‐transition temperature). Doping decreases the bond angles in the iron arsenide layers, suggesting a strong coupling of structural and electronic degrees of freedom.

Superconductivity and Crystal Structures of (Ba 1− x K x )Fe 2 As 2 ( x =0–1)