Abstract
A beam of polarized positive muons was stopped in semiconducting materials situated in a uniform magnetic field transverse to the beam direction. The precession of the positive muon was observed by detection of the decay positron coming from the asymmetric decay of the muon. Long-lived muonium was observed via its ''two-frequency'' precession in p-type samples of silicon and germanium. From the precession frequencies of muonium in silicon and germanium it has been determined that the Fermi contact interaction is reduced in these media compared to its vacuum value. This implies significant screening of the impurity potential of the muon in these materials. A series of frequencies other than the positive muon and muonium precession frequencies was detected in p-type silicon. The field dependence of these precession frequencies, tentatively designated ''anomalous'', has been studied for two different crystal orientations in the external field. A shift in these anomalous frequencies has been detected for the two crystal orientations at all fields. Since the states associated with the anomalous frequencies should have symmetries compatible with the lattice structure of silicon which is face centered cubic (diamond structure), a systematic study of magnetic orientational effects was done.
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