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Competing magnetic ground states in non-superconducting Ba(Fe1-xCrx)2As2

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arxiv 1009.1818 v1 pith:T3BELHOF submitted 2010-09-09 cond-mat.supr-con

Competing magnetic ground states in non-superconducting Ba(Fe1-xCrx)2As2

K. Marty , A. D. Christianson , C. H. Wang , M. Matsuda , H. Cao , L. H. VanBebber , J. L. Zarestky , D. J. Singh
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A. S. Sefat M. D. Lumsden
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classification cond-mat.supr-con
keywords concentrationsfe1-xcrxgroundmagneticnon-superconductingrapidlystatessuperconductivity
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We present neutron diffraction measurements on single crystal samples of non-superconducting Ba(Fe1-xCrx)2As2 as a function of Cr-doping for 0<=x<=0.47. The average SDW moment is independent of concentration for x<=0.2 and decreases rapidly for x>=0.3. For concentrations in excess of 30% chromium, we find a new G-type antiferromagnetic phase which rapidly becomes the dominant magnetic ground state. Strong magnetism is observed for all concentrations measured and competition between these ordered states and superconductivity naturally explains the absence of superconductivity in the Cr-doped materials.

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