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By using the first-principles calculation, we study the structural, magnetic, and electronic properties of the SrFeAsF compound and its Co-doped counterpart SrFe 1−x Co x AsF (x=0.125). It is shown that the competition of the nearest and next-nearest neighbor exchange coupling J1 and J2 between Fe ions gives rise to a frustrated striped antiferromagnetic order in SrFeAsF and an accompanied...
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