31P NMR Knight shifts in the UPY(Y = S,Se, Te) compounds

Nuclear magnetic resonance of ³¹P measurements have been made for UPY (where Y = S, Se and Te) compounds. The resonane lines show the effect of anisotropic Knight shifts. In the UPS, the NMR data indicate an axial symmetry of the phosphorus environment whereas for UPSe and UPTe the symmetry is lower than the axial one. The result for UPSe disagrees with earlier structural studies. An analysis of NMR spectra indicates that both the asymmetry parameter ε and the isotropic component of the Knight shift increase with the increase of atomic weight of the Y element.