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Emission Mössbauer Spectroscopy following the implantation of radioactive precursor isotope 57Mn+ (T 1/2= 1.5 min) into ZnO single crystals at ISOLDE/CERN shows that a large fraction of 57Fe atoms produced in the 57Mn beta decay is created as paramagnetic Fe3+ with relatively long spin-lattice relaxation times. Here we report on ZnO pre-implanted with 56Fe to fluences of 2×1013, 5×10 13 and 8 × 1013 ions/cm2 in order to investigate the dependence of the paramagnetic relaxation rate of Fe3+ on fluence. The spectra are dominated by magnetic features displaying paramagnetic relaxation effects. The extracted spin-lattice relaxation rates show a slight increase with increasing ion fluence at corresponding temperatures and the area fraction of Fe3+ at room temperature reaches a maximum contribution of 80(3)% in the studied fluence range.
Springer International Publishing
Publication date: 
1 Dec 2016

Hilary Masenda, S Geburt, Krish Bharuth-Ram, D Naidoo, HP Gunnlaugsson, K Johnston, R Mantovan, Torben Esmann Mølholt, M Ncube, S Shayestehaminzadeh, HP Gislason, G Langouche, S Ólafsson, C Ronning, ISOLDE Collaboration

Biblio References: 
Volume: 237 Issue: 1 Pages: 40
Hyperfine Interactions