Abstract
We have measured the transverse spin relaxation of positive muonsμ + in Al single crystals after irradiation at 150 K with 3 MeV electrons. The relaxation functions agree with those expected for diffusion-limited trapping of theμ + in monovacancies. Between 215 K and 60 K theμ + diffusivity is well described by the Flynn-Stoneham law (multi-phonon incoherent tunnelling between ground states) with an activation enthalpyH a = (30±2) meV. At lower temperatures, few-phonon (in particular one-phonon) processes become important. The decrease of the vacancy concentration by a factor of 100 during annealing between 227 K and 267 K has been studied.
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Arnold, K.P., Döring, K.P., Gladisch, M. et al. Incoherent tunnelling of positive muons and trapping by vacancies in electron-irradiated aluminium. Hyperfine Interact 17, 219–224 (1984). https://doi.org/10.1007/BF02065905
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DOI: https://doi.org/10.1007/BF02065905