Abstract
Raman scattering by optical phonons is used to study the interface intermixing in isotopic ( 70Ge) n ( 74Ge) m thin superlattices, with n and m equal to 8, 12, 16 and 24 atomic monolayers, for annealling at 500°C and various times. The experimental results compares very well with theoretical calculations within the planar force constant model and the bond polarizability approach. The diffusion is simulated by a combination of the virtual crystal approximation and the solution of the Fick’s diffusion equation for the superlattice geometry.
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