Heavy fermions in LiV₂O₄: Kondo compensation versus geometric frustration

Abstract

7Li NMR measurements were performed in the metallic spinel LiV2O4. The\ntemperature dependencies of the line width, the Knight shift and the\nspin-lattice relaxation rate were investigated in the temperature range 30 mK <\nT < 280 K. For temperatures T < 1 K we observe a spin-lattice relaxation rate\nwhich slows down exponentially. The NMR results can be explained by a\nspin-liquid behavior and the opening of a spin gap of the order 0.6 K.\n