Phosphorus Nuclear Magnetic Resonance in Transition-Metal Monophosphides: MnP,CoyMn1−yP, RuP, and WP

The phosphorus NMR has been observed in the paramagnetic state of the metallic ferromagnet MnP. The phosphorus Knight shift was measured as a function of temperature and was found to be temperature-dependent and negative, varying from about -11% at 375°K to -2% at 575°K. Constructing a $K^{31}\mathrm{}\left(T\right)\mathrm{}$-versus-$\chi \mathrm{}\left(T\right)\mathrm{}$ diagram for MnP yielded a straight line from which the total phosphorus hyperfine field was determined to be $H_{\mathrm{hf}}=-37.4\mathrm{}$ kOe per Bohr magneton. The effect of alloying cobalt into MnP upon the phosphorus Knight-shift data is presented. Additional phosphorus Knight-shift data in the nonmagnetic transition-metal monophosphides RuP and WP are also reported.