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The results of magnetization and NMR measurements of plutonium monophosphide are reported. A paramagnetic moment of 1.06μB was obtained from the χ^-1-versus-T plot, above the Curie temperature of 126^∘{}K, after subtracting a value of 190×{}10^-6 emu/mole for the temperature-independent orbital paramagnetism. A ferromagnetic moment of 0.42μB per formula unit was obtained for PuP. The Knight shift of P³¹ in PuP is linearly dependent on the magnetic susceptibility above the Curie temperature. An effective hyperfine field of - 51 kG was determined from the slope of the K-versus-χ curve. The relaxation rate can be described in terms of the Knight shift K≡KPuP-KThP by (T₁T)^-1=(23.5±1.7)×10²K (sec0ex0ex^∘K)^-1. The saturation moment is discussed in terms of the localized-$5f$-electron model, and the NMR results are discussed in terms of the coupling of the conduction electrons and the localized $5f$ electrons.
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Lam et al. (1969) studied this question.
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