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The lattice dynamics of solid 4He has been explored using pulsed NMR methodsto study the motion of 3He impurities in the temperature range whereexperiments have revealed anomalies attributed to superflow or unexpectedviscoelastic properties of the solid 4He lattice. We report the results ofmeasurements of the nuclear spin-lattice and spin-spin relaxation times thatmeasure the fluctuation spectrum at high and low frequencies, respectively, ofthe 3He motion that results from quantum tunneling in the 4He matrix. Themeasurements were made for 3He concentrations 16<x_3<2000 ppm. For 3Heconcentrations x_3 = 16 ppm and 24 ppm, large changes are observed for both thespin-lattice relaxation time T_1 and the spin-spin relaxation time T_2 attemperatures close to those for which the anomalies are observed inmeasurements of torsional oscillator responses and the shear modulus. Thesechanges in the NMR relaxation rates were not observed for higher 3Heconcentrations.

NMR Investigation of the Low Temperature Dynamics of solid 4He doped with 3He impurities