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Neutron diffraction study on the layer compounds MnPS 3 and FePS 3 reveals a collinear antiferromagnetic order, respectively, below T N =78 K and 120 K with the corresponding wave vectors k =000 and \ (0012\), the magnetic moments pointing to the direction perpendicular to the layer planes for both cases. The intralayer exchange parameters between first (J 1), second (J 2) and third nearest neighbors (J 3) are all antiferromagnetic for MnPS 3, whereas for FePS 3 J 1 is ferromagnetic and J 2 and J 3 are antiferromagnetic, all of which have the same sign as those for the respective selenium compounds, but the absolute values are a bit larger in the sulfides than in the selenides.
Kurosawa et al. (Tue,) studied this question.
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