Abstract
Abstract A new muonium centre, termed Mux, with anisotropic hyperfine interaction has been discovered in crystalline silicon in transverse-field muon spin rotation experiments. Its hyperfine tensor is very close to that of bond centred muonium (MuBC). The new muonium centre has been observed only in some of the many samples investigated. A correlation between dopant and oxygen concentration in the investigated samples and the observation of Mux has been found, which indicates that Mux might be related to a oxygen-muoniuni centre. According to the hyperfine tensor of Mux the new muonium species is attributed to an oxygen-MuBC complex. The Mux signal is affected by applied electrostatic fields in contrast with the signal of all other known muon species.
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