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Muonium states in HgO
Authors: J. M. Gil, H. V. Alberto, R. C. Vilão, J. Piroto Duarte, N. Ayres de Campos, A. Weidinger, E. A. Davis, S. F. J. Cox
Ref.: J. Phys. Condens. Matter 13, L613-L618 (2001)
Abstract: Experimental data on muonium states in HgO are presented, Muon spin rotation (mu SR) experiments show that, at low temperatures, approximately 80% of muons implanted into a polycrystalline sample form paramagnetic centres with hyperfine interaction parameters A(iso) = 14.93(5) MHz and D = 5.2(1) MHz. The remaining 20% form diamagnetic states. Diffusion of the paramagnetic state through equivalent sites is observed above 10 K, averaging the apparent anisotropy to a low value at and above 50 K. The variations of the amplitudes of the two signals with temperature indicate that the paramagnetic centres ionize in a temperature range centred around 160 K and that the associated donor levels lie considerably further from the conduction band edge than the corresponding states in ZnO and other II-VI compounds.
