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The authors have examined the magnetic structures of the antiferromagnetic layered compounds Co1/3NbS2 and Co1/3TaS2 using single-crystal neutron photographic and counting methods. The magnetic structure of Co1/3NbS2 has been determined in detail, and has an orthohexagonal unit cell, containing two Co atoms, arranged on the 'hexagonal ordering of the first kind' scheme. The different symmetries of the crystallographic and magnetic unit cells leads to a complicated domain structure. A large part of the magnetisation in this material is localised on the Co atoms, although the magnetic moment of the Co2+ ion is approximately 10% lower than that of the corresponding spin-only moment. The magnetic structure of the related material, Co1/3TaS2, which has the same crystal structure as Co1/3NbS2, is very different, and is a triangular antiferromagnetic structure although for this material only the unit cell has been determined.
Parkin et al. (Fri,) studied this question.