The results of magnetization and NMR measurements on neptunium monophosphide are reported. NpP orders in a complex manner at 120^∘{}K, and the paramagnetic susceptibility departs from Curie-Weiss behavior. The Knight shift of ³¹P follows a Curie-Weiss law and (T₁T) is linear in temperature from 175-360^∘{}K. The results on NpP, as well as earlier results on UP and PuP, are discussed in terms of a nonperturbative treatment of the crystalline electric fields and the coupling of the conduction electrons to the localized moments on the actinides.
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Lam et al. (1974) studied this question.
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