The magnetic properties of PrZn and NdZn compounds are studied by magnetic measurements and neutron diffraction. Both compounds are antiferromagnetic below 52 and 70 K, respectively. The ordered moments are reduced to 2.35 and 2.55 μB at low temperatures by crystal field effects. Dilatometric measurements reveal a large tetragonal distortion, arising at the Néel temperature and reaching 1.4% at 4.2 K in PrZn. The crystal field parameters are found coherent in sign with those of the heavy rare earth compounds. In PrZn, the magnetostriction is sufficient to explain the fourfold direction of the moment. The ambiguities on the magnetic structure are discussed.
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Morin et al. (1975) studied this question.
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