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Between 35° and 125°C there exists a threshold magnetic field strength at which the compound MnAs exhibits a large and steep increase of its net magnetization. At 35°C the threshold field is 40 koe. There is a large hysteresis associated with the magnetization change. This behavior resembles that exhibited by a material that is metamagnetic in the sense of Néel's description. We believe, however, that in this material the existence of a first-order phase transformation is sufficient to account for the magnetic behavior.
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Rodbell et al. (1960) studied this question.
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