Muonium dynamics in transparent conducting oxides |
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Authors: | Y.G. Celebi R.L. Lichti B.B. Baker P.W. Mengyan H.N. Bani-Salameh E. Catak |
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Affiliation: | 1. Department of Physics, Istanbul University, 34459 Beyazit, Istanbul, Turkey;2. Department of Physics, Texas Tech University, Lubbock, TX 79409-1051, USA |
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Abstract: | The motional and electrical properties of positively charged muonium (Mu+) centers in single crystal β-Ga2O3 are investigated via zero field muon spin relaxation (ZF-MuSR). Below room temperature we find two distinct shallow muonium centers with ionization energies of 7 and 16 meV. Above room temperature, at least three different Mu+ signals are resolved; two of these are metastable while the third shows characteristics of a stable ground state. As the temperature is elevated, metastable centers undergo several transitions. We obtain the relevant barrier energies associated with these site-change transitions. By 700 K, most muons occupy the mobile ground state, and an activation energy of about 1.65 eV is inferred for Mu+ diffusion from the hop rates obtained for this state. |
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Keywords: | Hydrogen Muonium Oxides Hydrogen diffusion Shallow donor |
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