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Title: Oxide muonics: A new compendium
Authors: Cox, S. F. J. 
Lord, J. S. 
Cottrell, S. P. 
Gil, J. M. 
Alberto, H. V. 
Piroto Duarte, J. 
Vilão, R. C. 
Keeble, D. J. 
Davis, E. A. 
Keren, A. 
Scheuermann, R. 
Stoykov, A. 
Charlton, M. 
van der Werf, D. P. 
Gavartin, J. 
Keywords: Muonium; Hydrogen doping
Issue Date: 2006
Citation: Physica B: Condensed Matter. 374-375:(2006) 379-382
Abstract: A new survey of muonium states brings the total of binary non-magnetic oxides studied to 30, with normal muonium--the interstitially trapped atomic state--found in 15 of these. The number of shallow-donor states of the type known in ZnO now also totals 15, but there are hints of several others. Tantalizingly, the shallow-donor and deep-atomic states are found to coexist in several of the candidate high-permittivity dielectrics. Highly anisotropic states, resembling anomalous muonium in semiconductors and including examples of muonium trapped at oxygen vacancies, complete a spectrum of hyperfine parameters covering five powers of ten. Effective ionization temperatures range from 10 K for shallow to over 1000 K for deep states, with corresponding activation energies between several meV and several eV. The oxide band gap emerges as a parameter controlling the systematics of the deep-to-shallow transition for muonium and, by inference, monatomic hydrogen.
DOI: 10.1016/j.physb.2005.11.106
Rights: openAccess
Appears in Collections:FCTUC Física - Artigos em Revistas Internacionais

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