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Delayed electron capture and Mu- formation in ZnSe
Vilão, R. C.; Gil, J. M.; Weidinger, A.; Alberto, H. V.; Piroto Duarte, J.; Costa, B. F. O.; Ayres de Campos, N.; Lichti, R. L.; Chow, K. H.http://www.sciencedirect.com/science/article/B6TVH-4V2NP2J-1R/2/ae8c94d2ee3229b6fe7881d93d1a64eb
Possible donor and acceptor energies for Mu in ZnSe
Lichti, R. L.; Carroll, B. R.; Vernon, J. E.; Bani-Salameh, H. N.; Chow, K. H.; Fan, I.; Egilmez, M.; Vilão, R. C.; Gil, J. M.; Alberto, H. V.http://www.sciencedirect.com/science/article/B6TVH-4V2NP2J-1G/2/9cc872ab4bb7b3920fd0a305f17d7708
Oxide muonics: A new compendium
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.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-permitti...
Muonium diffusion dynamics in mercury oxide
Piroto Duarte, J.; Gil, J. M.; Alberto, H. V.; Vilão, R. C.; Weidinger, A.; Ayres de Campos, N.; Cox, S. F. J.; Lord, J. S.; Cottrell, S. P.The diffusion dynamics of the neutral muonium state found in HgO is addressed in this work. We propose a hopping model for the diffusion, and use it to analyse time-domain [mu]SR data. It is found that the diffusion is an incoherent quantum process, with an activation energy of 5.2(2) meV. The analysis also points to the anti-bonding site as the best-suited candidate for the muon's localisation. ; http://www...
Hyperfine Parameters for Muonium in Copper (I), Silver (I) and Cadmium Oxides
Cox, S.; Lord, J.; Cottrell, S.; Alberto, H.; Gil, J.; Piroto Duarte, J.; Vilão, R.; Keren, A.; Prabhakaran, D.Abstract Muonium centres in Cu2O, Ag2O and CdO show hyperfine parameters spanning four orders of magnitude. They exemplify the three different categories of hydrogen defect centre in semiconducting and dielectric solids, with very different electronic structure and electrical activity, namely quasi-atomic (possibly deep acceptor), deep donor and shallow donor. ; http://dx.doi.org/10.1007/s10751-005-9058-7
Probing the shallow-donor muonium wave function in ZnO and CdS via transferred ...
Lord, J. S.; Cottrell, S. P.; King, P. J. C.; Alberto, H. V.; Ayres de Campos, N.; Gil, J. M.; Duarte, J. Piroto; Vilão, R. C.; Lichti, R. L.The assignment of muon spin rotation spectra to muonium counterparts of hydrogen shallow-donor states is reviewed in four II-VI widegap semiconductors, CdS, CdSe, CdTe and ZnO. The existence of extended electronic orbitals is argued from the muon-electron hyperfine parameters and supported by the new muon spin repolarization data for CdS and ZnO, characterizing the superhyperfine parameters on the sparse Cd and...
Landau diamagnetism of a weakly bound muonium atom
Storchak, V. G.; Eshchenko, D. G.; Cottrell, S. P.; Cox, S. F. J.; Karlsson, E.; Waeppling, R.; Gil, J. M.The ionization with temperature of weakly bound muonium atoms in undoped CdS has been studied using the technique of muon spin relaxation in a transverse magnetic field of 10 mT. For this atom the Coulomb binding energy between the muon and the electron is sufficiently small that the Landau diamagnetic term determines the magnetic behavior of the system: due to the diamagnetic interaction the muon precession in...
Powder Pattern Hyperfine Spectroscopy of Shallow- Donor Muonium Centres
Alberto, H.; Vilão, R.; Duarte, J. Piroto; Gil, J.; Campos, N. Ayres de; Lichti, R.; Davis, E.; Cottrell, S.; Cox, S.Abstract The hyperfine spectroscopy of muonium in II–VI semiconductors is reviewed, suggesting that whereas hydrogen is a deep-level defect in ZnS, ZnSe and ZnTe, it constitutes a shallow donor in ZnO, CdS, CdSe and CdTe. Shallow and deep states coexist in CdTe. Using new data for ZnO, it is shown that the principal values of the muonium hyperfine tensor may be obtained with equal facility from measurements in...
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