Abstract
A new muonium centre, termed Mu X , with anisotropic hyperfine interaction has been discovered recently in crystalline silicon in transverse-field muon spin rotation experiments (Schefzik et al., Philos. Mag. B 79 (1999) 1561). Its hyperfine tensor is very close to that of bond centred muonium (Mu BC). The signature of Mu X is only observable in samples containing oxygen in a concentration which is higher than that of the donors or acceptors. This indicates that Mu X is related to an oxygen–muonium centre. In the present work we have carried out a study of the temperature behaviour of the Mu X signal on a sample showing a very pronounced Mu X signature. The observations clearly show that the Mu X signal, on the one hand, and the Mu BC signals, on the other, have an identical temperature dependence.
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