Lattice Relaxation in Solid He: Effect on Dynamics of He Impurities

Sullivan, N.; Candela, D.; Kim, S.; Huan, C.; Yin, L.; Xia, J.
April 2014
Journal of Low Temperature Physics;Apr2014, Vol. 175 Issue 1/2, p133
Academic Journal
We present a new simplified derivation of the effect of lattice relaxation that accompanies the quantum tunneling of He impurities in solid He on the nuclear spin-lattice relaxation of the He impurities for very low impurity concentrations. As a result of the larger zero point motion of the He impurity compared to the He atoms, a significant lattice distortion accompanies the impurity as it moves through the lattice and the dynamics of the impurity depends on both the interaction energy between two He atoms and on the relaxation of the lattice for the tunneling impurity. Using a phenomenological model for the lattice relaxation we compare the nuclear spin-lattice relaxation rates observed at low temperatures with the dependence on temperature expected for a He lattice relaxation comparable to that observed by Beamish et al. (Phys. Rev. Lett. 96:195304, ).


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