Abstract
The low temperature electron polarization of the shallow muonium state in CdTe and CdS has been measured. We find a strong deviation of the polarization from that expected for paramagnetic muonium in thermodynamical equilibrium. In addition, in CdTe the observed polarization changes with the age of the sample and even an inversion of the polarization is observed upon annealing. An explanation of these findings is given in terms of two different routes for the formation of shallow muonium, i.e., formation by capture of an electron from the conduction band and formation via conversion from deep to shallow muonium. We conclude that the electron polarization is not due to the paramagnetism of the final shallow state but to the polarization buildup in the preceding stage immediately following muon implantation.
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