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Propagation of Acoustic Phonons in Amorphous Superlattices

Published online by Cambridge University Press:  26 February 2011

P. V. Santos ,
L. Ley ,
J. Mebert  and
J. Koblinger
P. V. Santos
Affiliation:
Max-Planck-Institut für Festkörperforschung, HeisenbergstraBe 1, D-7OOO Stuttgart 80, Federal Republic of Germany.
L. Ley
Affiliation:
Max-Planck-Institut für Festkörperforschung, HeisenbergstraBe 1, D-7OOO Stuttgart 80, Federal Republic of Germany.
J. Mebert
Affiliation:
Phys. Institut Teill, Universität Stuttgart, Pfaffenwaldring 57, D-7000 Stuttgart 80, Federal Republic of Germany.
J. Koblinger
Affiliation:
Phys. Institut Teill, Universität Stuttgart, Pfaffenwaldring 57, D-7000 Stuttgart 80, Federal Republic of Germany.
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Abstract

We have investigated the Raman and the phonon transmission spectra of a-Si:H/a-SiNx:H super lattices. At low wavenumbers, the Raman spectrum shows sharp peaks corresponding to the excitation of modes from the folded branches of the dispersion relation for longitudinal acoustic phonons propagating perpendicular to the layers. Energy gaps in the folded phonon dispersion occur at the center and at the boundary of the mini-Brillouin zone due to the differences in the acoustic impedances of the layers. The size of the lowest gaps was determined by light scattering. The phonon transmission spectra show transmission minima that we attribute to the frequency gaps in the dispersion of transversal acoustic phonons. The position and width of these minima are compared with the dispersion obtained from the Raman data.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 77: Symposium D – Interfaces, Superlattices, and Thin Films , 1986 , 583
Copyright
Copyright © Materials Research Society 1987

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References

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