Hyperfine field and diffusion of μ+ in Fe single crystals |
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| Authors: | N Nishida RS Hayano K Nagamine T Yamazaki JH Brewer DM Garner DG Fleming T Takeuchi Y Ishikawa |
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| Institution: | Department of Physics, University of Tokyo, Tokyo, Japan;TRIUMF, Vancouver, Canada;TRIUMF and Department of Chemistry, University of British Columbia Vancouver, Canada;National Research Institute for Metals, Nakameguro, Tokyo, Japan;Physics Department, Tohoku University, Sendai, Japan |
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| Abstract: | In recent positive-muon spin rotation experiment at TRIUMF on single crystal Fe, a clear temperature dependent change has been observed, for the first time, both in frequency and depolarization rates from 300 K down to 23 K. The μ+ depolarization was explained by the μ+ diffusion through inhomogeneous dipolar fields and the diffusion constant was found to obey an Arrhenius law (activation energy 17 meV) above 70 K but surprisingly deviated from this at lower temperatures, indicating quantum diffusion. We have also found that the μ+ hyperfine field has a temperature dependence slightly stronger than that of the magnetization. |
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