期刊
PHYSICAL REVIEW LETTERS
卷 84, 期 13, 页码 2965-2968出版社
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.2965
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strong influence of nuclear spins on resonant quantum tunneling in the molecular cluster Fe-8 is demonstrated for the first time by comparing the relaxation rate of the standard Fee sample with two isotopic modified samples: (i) Fe-56 is replaced by Fe-57, and (ii) a fraction of H-1 is replaced by H-2. By using a recently developed hole digging method, we measured an intrinsic broadening which is driven by the hyperfine fields. Our measurements are in good agreement with numerical hyperfine calculations. For T > 1.5 K, the influence of nuclear spins on the relaxation rate is less important, suggesting that spin-phonon coupling dominates the relaxation rate.
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