Abstract
7Li nuclear magnetic resonance and heat capacity measurementswere performed on the metallic spinel LiV2O4 down to 30 mK.The temperature dependencies of the linewidth, the Knight shift andthe spin-lattice relaxation rate were investigated in thetemperature range 30 mK⩽T⩽280 K and at appliedmagnetic fields of 4.6, 10, 44 and 83 kOe. The longitudinal nuclearmagnetization was found to relax following a stretched-exponentialform with a stretching exponent in the range 0.5<β<1. Fortemperatures T<1 K and at the lowest applied magnetic field of4.6 kOe, we observe a spin-lattice relaxation rate which slows downexponentially, exhibiting a hindering barrier of the order of 1 K.This excitation energy separates different configurations of ahighly degenerate ground state of a completely frustrated magnet.
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