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Persistent URL http://purl.org/net/epubs/work/65902
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Record Id 65902
Title Motion of positively charged muonium in ZnO
Abstract We report on a study of the motional characteristics of positively charged muonium defect centers in ZnO as an analog for H+ behavior. Muon spin depolarization measurements at zero applied magnetic field were completed from 20 K to 400 K, with preliminary results to 750 K. Results at the lower temperatures imply that Mu+ occupied two sites, and indicate local motion as thermally assisted tunneling with a characteristic energy of ∼60 meV, as well as a site change transition above 200 K with barrier energy ∼440 meV. Based on theoretical results, we have tentatively assigned these features to tunneling among three equivalent oxygen anti-bonding sites (AB⊥) and a transition to a lower-energy bond-centered site (BC‖) oriented along the c-axis. Preliminary fits suggest that global diffusion of muonium occurs above 400 K, with a diffusion barrier energy of ∼0.7 eV.
Organisation ISIS , ISIS-EMU , STFC
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Language English (EN)
Type Details URI(s) Local file(s) Year
Journal Article Physica B 407, no. 15 (2012): 2864-2866. doi:10.1016/j.physb.2011.08.026 2012