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The problem of magnetic phase transitions between ferromagnetism and antiferromagnetism, or between two different kinds of antiferromagnetic arrangement, is treated by a molecular field approach. It is shown that such transitions may occur if the molecular field coefficients vary with temperature; if they do occur, they will be of first order. The theoretical results agree qualitatively with the experimental results of Guillaud and Serres on MnAs.
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J. S. Smart (1953) studied this question.
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