Abstract

Muon nuclear-quadrupole level-crossing resonances (QLCR) and zero-field muon spin depolarization functions are identified for negatively charged muonium (Mu−) centers in wurtzite-structured GaN.The QLCR spectra imply that Mu− occupies interstitial locations next to Ga atoms, consistent with the two inequivalent Ga anti-bonding sites. Mu− related depolarization shows an increase in average dipolar fields near 200K and indicates motion above 500K. Transitions suggested by relaxation features are briefly discussed.

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