Observation of the Antiferromagnetic Order in Metallic Compounds V3S4and V3Se4

The 51 V NMR in the metallic V 3 S 4 and V 3 Se 4 have been investigated in the temperature range between 1.4 K and 300 K by the phase-coherent pulsed NMR technique. The spin-echo spectra for V 3 S 4 and V 3 Se 4 are broadened rapidly below 9 K and 16 K, respectively, showing the antiferromagnetic long range order below these temperatures. The temperature dependences of the 51 V Knight shift, the uniform susceptibility and the hyperfine field which corresponds to the sublattice magnetization are in general accord for both cases with the prediction of the self-consistent renormalization theory for weak itinerant antiferromagnets.