POWDER SPECTRA OF V-51 NMR IN CUV2S4 - POSSIBLE COEXISTENCE OF CHARGEAND SPIN-DENSITY WAVES

NMR experiments are reported for the copper chalcogenide spinel CuV2S4 , which has incommensurate lattice distortions at low temperatures in spite of the cubic symmetry at high temperature. A broad spin-echo spe ctrum of V-51 has been observed below 90 K at 17 MHz, but it shows a r emarkable frequency dependence where it becomes sharper with decreasin g frequency. possible coexistence of charge and spin density waves is suggested at low temperatures in this material.