NMR studies on polyphosphide Ce₆Ni₆P₁₇

We report the result of ³¹P nuclear magnetic resonance (NMR) studies on Ce₆Ni₆P₁₇. The observed NMR spectra show a Lorentzian-type and an asymmetric shapes, reflecting the local symmetry around each P site in the cubic unit cell. We have identified the observed NMR lines corresponding to three inequivalent P sites and deduced the temperature dependence of the Knight shift for each site. The Knight shifts increase with decreasing temperature down to 1.5 K, indicating a localized spin system of Ce₆Ni₆P₁₇. Antiferromagnetic correlation between 4f spins is suggested from the negative sign of the Weiss-temperature. (paper)