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

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arxiv cond-mat/0001234 v1 pith:ZZALPD24 submitted 2000-01-17 cond-mat.mes-hall

W. Wernsdorfer , A. Caneschi , R. Sessoli , D. Gatteschi , A. Cornia , V. Villar , C. Paulsen This is my paper · ORCID
classification cond-mat.mes-hall
keywords relaxationnuclearratespinshyperfineinfluencemolecularquantum
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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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