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https://hdl.handle.net/10316/4528
Título: | Shallow-level muonium centre in CdS | Autor: | 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. |
Palavras-chave: | II-VI semiconductors; Hydrogen-like defects; Muonium states | Data: | 2000 | Citação: | Physica B: Condensed Matter. 289-290:(2000) 563-566 | Resumo: | 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 of ad=26a0=1.4Â nm is calculated for this defect, with a0 being the Bohr radius for the free muonium. | URI: | https://hdl.handle.net/10316/4528 | DOI: | 10.1016/S0921-4526(00)00257-X | Direitos: | openAccess |
Aparece nas coleções: | FCTUC Física - Artigos em Revistas Internacionais |
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file2bcc3d61158e47699c4a147ba0d19dd6.pdf | 138.25 kB | Adobe PDF | Ver/Abrir |
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