Abstract
The anomalous behaviour of the heat capacities at the Neel points of copper-manganese alloys containing 80 and 85 at.% Mn is more marked than that observed in other metallic antiferromagnetics. The entropies associated with the anomalies are 0.20 and 0.35 cal mol-1 deg-1, respectively, and are significantly less than the value R ln (2S+1) predicted by localized theories of antiferromagnetism. It is concluded that these results indicate that the appropriate model of antiferromagnetism in metals is not one based on completely localized moments.
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