Abstract
Abstract We report on combined RF- μ SR and electric fields (EF) μ SR measurements in semi-insulating GaP. At low temperature the capture of excess carriers by a neutral muonium ( Mu = μ + + e - ) center is suggested to be a dominant process in muonium charge dynamics. The charged muonium fraction ( Mu - or Mu + ) formed on the microsecond time-scale is increased with lowering the temperature. Contrary to the usually observed scenario, at T 40 K an EF prevents formation of the final charged state.
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