Abstract
A type of surface structural transformation of metastable alpha-Sn epitaxially grown on InSb (001) has been investigated in situ with RHEED and Auger valence electron spectroscopy. Concerned with structural transformation of bulk Sn from the alpha (diamond cubic structure) to beta (tetragonal structure) phase, a type of surface structural transformation has been observed in RHEED. The eoitaxial layer of alpha-Sn showed a 2 × 1 two-domain superstructure. Upon heating, the superstructure disappeared at the critical temperature. Three-dimensional islands were found by transformation in the thick specimens. The transformation temperature depended on the layer thickness of metastable alpha-Sn. Related to the structural transformation, the spectral change in Sn[4 p, V, V] Auger transition has been found also at the critical temperature. The Auger and RHEED data suggest the crucial role of the lattice matching condition between the epitaxial layer and the substrate on the critical temperature.
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