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Effect of Ni doping on magnetism and superconductivity in Eu<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mrow><mml:mn>0.5</mml:mn></mml:mrow></mml:msub></mml:math>K<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mrow><mml:mn>0.5</mml:mn></mml:mrow></mml:msub></mml:math>Fe<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>2</mml:mn></…
The effect of Ni doping on the magnetism and superconductivity in Eu${}_{0.5}$K${}_{0.5}$Fe${}_{2}$As${}_{2}$ has been studied through a systematic investigation of magnetic and superconducting properties of Eu${}_{0.5}$K${}_{0.5}$(Fe${}_{1\ensuremath{-}x}$Ni${}_{x}$)${}_{2}$As${}_{2}$ ($x=0$, 0.03, 0.05, 0.08, and 0.12) compounds by means of dc and ac magnetic susceptibilities, electrical resistivity, and specific heat measurements. Eu${}_{0.5}$K${}_{0.5}$Fe${}_{2}$As${}_{2}$ is known …