Sullivan, N. S.Candela, D.Kim, S. S.Huan, C.Yin, L.Xia, J. S.2014-04-142014-04-142014-04-14201410.1007/s10909-013-0932-4https://infoscience.epfl.ch/handle/20.500.14299/102768WOS:000332486200019We present a new simplified derivation of the effect of lattice relaxation that accompanies the quantum tunneling of He-3 impurities in solid He-4 on the nuclear spin-lattice relaxation of the He-3 impurities for very low impurity concentrations. As a result of the larger zero point motion of the He-3 impurity compared to the He-4 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-3 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-4 lattice relaxation comparable to that observed by Beamish et al. (Phys. Rev. Lett. 96:195304, 2006).TunnelingNMRLattice relaxationtext::journal::journal article::research article