Depolarization mechanisms for muonium in germanium

The depolarization rate $\lambda$ of normal and anomalous muonium in Ge was studied as a function of temperature and doping. Evidence for three different depolarization mechanisms is presented: (i) exchange interaction with paramagnetic doping atoms ($T<\mathrm{}20\mathrm{}$ K); (ii) Korringa scattering of impurity charge carriers ($20<T<\mathrm{}50\mathrm{}$ K); and (iii) an intrinsic process, either a chemical reaction or a spin-lattice relaxation ($T>\mathrm{}50\mathrm{}$ K).