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- W57504516 abstract "Recent theoretical considerations suggest that at low temperatures the transport properties of light interstitials in metals are dominated by the interaction with the conduction electrons. After briefly surveying the state of the theory, we examine experimental results for muon diffusion in Aℯ and Cu. In Aℯ muon diffusion is observed via diffusion-limited trapping, and local properties of the impurity as well as long-range diffusion are playing a role. Using a large variety of impurities it was possible to evaluate the diffusion coefficient over nearly 4 orders of magnitude in temperature. Other than in Aℯ, in Cu muon diffusion is observed directly through motional narrowing due to elementary jumps. Qualitatively, the observed jump rates show a very similar behaviour as in Aℯ. Quantitatively, they are 3 orders of magnitude slower. In both cases a low T power law behaviour (D ~ T−α) is found. After passing through a minimum the diffusion coefficient first increases linearly, thereafter exponentially with temperature. Using Kondo’s theory /1/ together with recent developments in the small polaron theory, the experimental data are discussed.: In the low T limit a good explanation of the observed diffusion behaviour is possible. The intermediate range (D ~ T) is indicative for a one-phonon process while at high T the usual multiphonon processes are dominant." @default.
- W57504516 created "2016-06-24" @default.
- W57504516 creator A5037945714 @default.
- W57504516 date "1987-01-01" @default.
- W57504516 modified "2023-09-23" @default.
- W57504516 title "Quantum Diffusion of Light Interstitials in Metals" @default.
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- W57504516 doi "https://doi.org/10.1007/978-3-642-71914-1_25" @default.
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