Journal
JOURNAL OF LOW TEMPERATURE PHYSICS
Volume 175, Issue 1-2, Pages 133-139Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10909-013-0932-4
Keywords
Tunneling; NMR; Lattice relaxation
Categories
Funding
- NSF [DMR-1303599]
- [NSF-DMR-1157490]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1303599] Funding Source: National Science Foundation
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We 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).
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