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Spin exchange of muonium in CdS

Authors: J.M. Gil, J. Piroto Duarte, R.C. Vil√£o, H.V. Alberto, N. Ayres de Campos, S.F.J. Cox

Ref.: Physica B: Condensed Matter 404, 834-836 (2009)

Abstract: High-statistics, high frequency resolution mu SR transverse-field time spectra were obtained on a high-purity CdS single crystal in the low temperature range where the shallow-donor muonium state is seen to ionize. A model by Senba was used to fit the data, considering a spin exchange of the muonium electron in the transition region from slow to fast spin-flip regimes. The phase shifts, collapse, and broadening observed in the high-field precession frequencies of the Mu state are explained by this model, implying the involvement of spin dynamics in the ionization process of the shallow-donor muonium state. (c) 2008 Elsevier B.V. All rights reserved.

DOI: 10.1016/j.physb.2008.11.159