Abstract
We discuss the analysis of the experimental values of the nuclear spin–lattice and spin–spin relaxation times for the tunneling of \(^3\)He as isotopic impurities in solid \(^4\)He. These two relaxation times cannot be described quantitatively using a unique correlation time although it is often presented as such in the literature. In this paper, we discuss how to distinguish the high-frequency portion of the spectral densities that determine the spin–lattice relaxation rates from the low-frequency components which determine the spin–spin relaxation rates.
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Acknowledgments
We gratefully acknowledge numerous discussions with Brian Cowan, Maurice Chapellier, Henri Godfrin, Pradeep Kumar, and Alan Dorsey. The experimental work at very low \(^3\)He concentrations was carried out at the National High Magnetic Field Laboratory’s High B/T Facility supported by the National Science Foundation through DMR-1157490. NS also acknowledges the support from DMR-1303599.
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Huan, C., Kim, S.S., Candela, D. et al. Quantum Tunneling of \(^3\)He in Solid \(^4\)He: A New Analysis. J Low Temp Phys 185, 354–362 (2016). https://doi.org/10.1007/s10909-016-1637-2
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DOI: https://doi.org/10.1007/s10909-016-1637-2