The effects of nuclear spins on the quantum relaxation of the magnetization for the molecular nanomagnet Fe_8

Details The effects of nuclear spins on the quantum relaxation of the magnetization for the molecular nanomagnet Fe_8 The effects of nuclear spins on the quantum relaxation of the magnetization for the molecular nanomagnet Fe_8

2000-01-17

arxiv.org/abs/cond-mat/0001234v1

Phys. Rev. Lett. 84, 2965 (2000)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.84.2965

The 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 Fe_8 sample with two isotopic modified samples: (i) 56_Fe is replaced by 57_Fe, and (ii) a fraction of 1_H is replaced by 2_H. 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 at higher temperature.

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