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We report measurements of 19F nuclear spin-lattice relaxation 1/T1 as afunction of temperature and external magnetic field in LiY0.998Ho0.002F4 singlecrystal, a single-ion magnet exhibiting interesting quantum effects. The 19F1/T1 is found to depend on the coupling with the diluted rare-earth (RE)moments. Depending on the temperature range, a fast spin diffusion regime or adiffusion limited regime is encountered. In both cases we find it possible touse the 19F nucleus as a probe of the rare-earth spin dynamics. The results for1/T1 show a behavior similar to that observed in molecular nanomagnets, aresult which we attribute to the discreteness of the energy levels in bothcases. At intermediate temperatures the lifetime broadening of the crystalfield split RE magnetic levels follows a T3 power law. At low temperature thefield dependence of 1/T1 shows peaks in correspondence to the critical magneticfields for energy level crossings (LC). The results can be explained byinelastic scattering between the fluorine nuclear spins and the RE magneticlevels. A key result of this study is that the broadening of the levels at LCis found to be become extremely small at low temperatures, about 1.7 mT, avalue which is comparable to the weak dipolar fields at the RE latticepositions. Thus, unlike the molecular magnets, decoherence effects are stronglysuppressed, and it may be possible to measure directly the level repulsions atavoided level crossings.Comment: 21 pages, 5 figure

physical review. b, condensed matter and materials physics

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Probing spin dynamics and quantum relaxation inLiY0.998Ho0.002F4via