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Mossbauer-effect measurements show that for Eu metal, intermediate-valence and antiferromagnetic ordering states coexist over the pressure range 0 to 14 GPa for temperatures below the N\'eel temperature of about 90 K. As the average valence increases with pressure up to 12 GPa, the magnetization decreases due to a dilution of the average magnetic moment per atom.
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Farrell et al. (1987) studied this question.
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