Magnetic Susceptibility and Nuclear Magnetic Resonance in Transition-Metal Monophosphides

The magnetic susceptibilities of the monophosphides of V, Cr, Fe, and Co have been measured from 4.2^∘{}K to room temperature. They were all found to be weakly paramagnetic. The previously reported metamagnetic transition in the MnP was confirmed, whereas none of the other compounds exhibited a magnetic transition. The relative magnitudes of the susceptibilities are shown to be consistent with a band structure proposed by Goodenough in which Mott's suggestion of a critical distance for localized or itinerant electron states is used. The uniqueness of magnetism in MnP is shown to result from the intersection of the Fermi level with a localized electron state before exchange splitting occurs. The nuclear magnetic resonance frequencies of P³¹ and Co⁵⁹ were also measured and indicated some overlapping of the d band with the conduction band.