Abstract
Experiments are reported which show that the tetragonal distortion in an AuMn alloy below the Néel temperature depends on the square of the antiferromagnetic order parameter. This result is shown to be consistent with a distortion dependent magnetic exchange energy. The specific heat of an AuMn alloy has been measured in the range 100°–600°K and the magnetic part of the specific heat curve agrees in detail with the predictions of a distortion modified molecular field model with S = 2.
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