Two polycrystalline samples of neodymium dihydride have been investigated by both ac-susceptibility and dc-magnetization measurements. The ac susceptibility displays a sharp peak at 5.8±0.1 K, suggestive of the onset of long-range ferromagnetic order. The dc magnetization shows the onset of coercivity and remanence at the same temperature. Arrott plots of the magnetization confirm ferromagnetic order at 5.6 K. However, saturation is not observed at 4.2 K in external fields up to 60 kOe.
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Carlin et al. (1982) studied this question.
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