Abstract
We report measurements of the longitudinal field-dependent muon-spin relaxation rate (${\mathit{T}}_{1}^{\mathrm{\ensuremath{-}}1}$) in n-type Si and GaAs under conditions where coherent spin precession of muonium is unobservable. A peak in ${\mathit{T}}_{1}^{\mathrm{\ensuremath{-}}1}$ as a function of magnetic field is observed and shown to be characteristic of neutral bond-centered muonium (${\mathrm{Mu}}_{\mathrm{BC}}^{0}$) experiencing spin-exchange scattering with free carriers. These results establish that neutral ${\mathrm{Mu}}_{\mathrm{BC}}^{0}$ does not convert to negatively charged muonium in n-type Si below approximately 200 K and is present in metallic n-type GaAs:Si at 5.5 K.
Published Version
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