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; A. S. Sefat; M. D. Lumsden

doi:10.1103/PhysRevB.83.060509

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

Superconductivity 2011-03-16 v1

Authors: K. Marty , A. D. Christianson , C. H. Wang , M. Matsuda , H. Cao , L. H. VanBebber , J. L. Zarestky , D. J. Singh , A. S. Sefat , M. D. Lumsden

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Abstract

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.

Keywords

magnetic ground states Ba(Fe1-xCrx)2As2 neutron diffraction spin density wave G-type antiferromagnetism superconductivity

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@article{arxiv.1009.1818,
  title  = {Competing magnetic ground states in non-superconducting Ba(Fe1-xCrx)2As2},
  author = {K. Marty and A. D. Christianson and C. H. Wang and M. Matsuda and H. Cao and L. H. VanBebber and J. L. Zarestky and D. J. Singh and A. S. Sefat and M. D. Lumsden},
  journal= {arXiv preprint arXiv:1009.1818},
  year   = {2011}
}

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4 pages, 3 figures

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

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