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Possible donor and acceptor energies for Mu in ZnSe

Authors: R.L. Lichti, B.R. Carroll, J.E. Vernon, H.N. Bani-Salameh, K.H. Chow, I. Fan, M. Egilmez, R.C. Vil√£o, J.M. Gil, H.V. Alberto, J. Piroto Duarte, N. Ayres de Campos, S.P. Cottrell, S.F.J. Cox

Ref.: Physica B: Condensed Matter 404, 827-830 (2009)

Abstract: Multiple charge-state transitions are observed for muonium in heavily compensated ZnSe. A paramagnetic resonance signal for the state known as Mull is present to similar to 350K, but has decreased amplitude between 30 and similar to 200 K, disappearing completely in one sample. Satellite lines in the Mu(II) spectrum identify it as Mull at the T-site with Se neighbours. We obtain an ionization energy of similar to 0.4eV for this Mu donor location. Loss of Mu(II) and growth of a diamagnetic signal near 25 K had been assigned to electron capture by Mu(0), and its loss near 80 K to e(-) emission from Mu(-) to the conduction band. We offer an alternative explanation for the loss of Mu- amplitude, and suggest that high-temperature growth of diamagnetic amplitude be associated with Mu acceptor ionization. This alternative model gives thermodynamic levels for Mu in ZnSe that fit well into the overall picture of H in semiconductors. (c) 2008 Elsevier B.V. All rights reserved.

DOI: 10.1016/j.physb.2008.11.161