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- W1978290216 abstract "The presence of Si donors in GaAs exerts a strong influence on the charge state and diffusion of muonium at the tetrahedral interstitial site (${mathrm{Mu}}_{mathit{T}}^{0}$), while it has relatively weak effect on the bond-center muonium (${mathrm{Mu}}_{mathrm{BC}}^{0}$). In metallic GaAs:Si, the highly mobile ${mathrm{Mu}}_{mathit{T}}^{0}$ center observed in nonmetallic GaAs is replaced by a charged species (probably ${mathrm{Mu}}^{mathrm{ensuremath{-}}}$) which shows a diffusion rate at least ${10}^{mathrm{ensuremath{-}}2}$ times smaller than the ${mathrm{Mu}}_{mathit{T}}^{0}$ center. The ${mathrm{Mu}}_{mathrm{BC}}^{0}$ center is metastable and its transition to ${mathrm{Mu}}_{mathit{T}}^{0}$ or ${mathrm{Mu}}^{mathrm{ensuremath{-}}}$ centers (depending on doping concentration) is seen in the 50--150-K range. The current results also suggest that the ${mathrm{Mu}}_{mathit{T}}^{0}$ state undergoes fast spin-exchange interaction with conductive carriers prior to the transition ${mathrm{Mu}}_{mathit{T}}^{0}$ensuremath{rightarrow}${mathrm{Mu}}^{mathrm{ensuremath{-}}}$." @default.
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- W1978290216 date "1994-07-15" @default.
- W1978290216 modified "2023-09-30" @default.
- W1978290216 title "Charge state and diffusivity of muonium in<i>n</i>-type GaAs" @default.
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- W1978290216 doi "https://doi.org/10.1103/physrevb.50.1999" @default.
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