Abstract
Cu-Mn alloys with 25 to 66 at.% Mn are mictomagnetic. The freezing temperature has a maximum at ∼ 50 at.% Mn. The Curie constant, the unidirectional remanence after field-cooling to 4.2 K and the susceptibility after zero-field cooling to 4.2 K decrease sharply with increasing Mn content. These results can be accounted for in terms of antiferromagnetic coupling between nearest neighbor Mn moments, which gives reise to increasingly massive short range antiferromagnetism as the Mn content increases.
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