Abstract:
The antiferromagnetic structures of MnS2, MnSe2, and MnTe2 have been obtained by neutron diffraction. The disulfide exhibits ordering of the "third" kind, the ditelluride, ordering of the "first" kind, and the diselenide, an arrangement which is intermediate between the two. The structures are discussed from the viewpoint of indirect exchange. Magnetic susceptibilities, obtained by the Gouy method, are reported for all three compounds.
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In an effort to further elucidate the role of the anion in antiferromagnetism, these studies have been extended to the homologous series consisting of MnS2, MnSe2, and MnTe2. These compounds crystallize with the pyrite structure, which is a NaCl-like arrangement of M and X2 groups with the axes of the X2 groups parallel to the various body diagonals. The structure is shown schematically in Fig. 1.
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