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New intensity data from CoO in the antiferromagnetic state have been obtained with a high-resolution neutron diffractometer. These improved data can be interpreted by a collinear spin structure with an angle of 27.4^∘{} between the spin axis and the c axis, as compared with the older data of Roth which gave this angle as 11.5^∘{}. Alternatively a multi-spin-axis model is proposed which explains the intensity data equally well. This model is related to the collinear model B proposed by Li and has a tetragonal spin superstructure in conformity with the tetragonal crystallographic deformation below the N\'eel temperature.
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B. van Laar (1965) studied this question.
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