Shallow-level muonium centre in CdS
- Gil, J. M.
- Alberto, H. V.
- Vilão, R. C.
- Duarte, J. Piroto
- Mendes, P. J.
- Campos, N. Ayres de
- Weidinger, A.
- Krauser, J.
- Niedermayer, Ch.
- Cox, S. F. J.
DOIAbstract
A new type of muonium defect centre has been observed in undoped CdS at low temperatures (T<20Â K). The hyperfine parameters are A[short parallel]=335 (7)Â kHz and A[perpendicular]=199 (6)Â kHz (approximately 10-4 of the vacuum value) with the symmetry axis along the Cd-S bond direction. The disappearance of the centre at around 20Â K is in agreement with the binding energy of a shallow centre. The extremely weak hyperfine interaction implies that the electron is only weakly bound to the muon and is distributed over a large complex of atoms in the neighborhood of the muon resembling the dilated hydrogen-like wave functions of shallow centres in a dielectric medium. Comparing the hyperfine interaction with that of free muonium, a Bohr radius...
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