Abstract
The Co60Mu radical in polycrystalline C60 has been studied in zero magnetic field between 9 K and 200 K, and at room temperature. At low temperatures, we observe three low-frequency oscillations which correspond to the intra-triplet transitions of a completely anisotropic muon-electron hyperfine interaction. These signals exhibit a strongly temperature-dependent T1, attributed to thermally-activated jump rotational diffusion of the C60Mu radical. A fit to an Arhenius law yields an activation energy of 200(20) meV for temperatures below the fcc-sc structural phase transition. At room temperature only the motionally-narrowed 325 MHz singlet-triplet transition is observed.
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Duty, T.L., Brewer, J.H., Chow, K. et al. Zero-field μSR in crystalline C60 . Hyperfine Interact 86, 789–795 (1994). https://doi.org/10.1007/BF02068978
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DOI: https://doi.org/10.1007/BF02068978