Abstract

After a brief description of muon spin rotation and muonium, the observations on muonium defect centers in semiconductors are described. Two different muonium centers are seen. Normal muonium has an isotropic hyperfine interaction which is roughly one half of that for free muonium. Anomalous muonium has a contact hyperfine parameter varying from 1.5% to 4.6% of that for free muonium. In addition, the hyperfine interaction is highly anisotropic. Normal muonium is thought to be interstitial, whereas anomalous muonium is proposed to be substitutional.

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