Folded Acoustic phonons in (CdTe)n/(MnTe)m superlattices

Michel Jouanne 2Jean-Francois Morhange 2Wojciech Szuszkiewicz 1Grzegorz Karczewski 1

1. Polish Academy of Sciences, Institute of Physics, al. Lotników 32/46, Warszawa 02-668, Poland
2. Laboratoire des Milieux Desordonnes et Heterogenes, Universite Pierre et Marie Curie (LMDH UPMC), 4, Place Jussieu, Paris 75252, France

Abstract

Several short-period, zinc blende (CdTe)n/(MnTe)m superlattices, grown by molecular beam epitaxy, have been studied by Raman spectroscopy. All structures were deposited on (001) oriented GaAs or CdZnTe substrates. The folded longitudinal acoustic phonons (FLA), up to the fourth order, were well observed in the standard backscattering geometry with the incident and scattered polarization parallel to the <010> axis. The frequencies of those FLA correctly followed the usual dispersion law with the superlattice periodicity which allowed us to determine the unknown elastic constant C11 of zinc blende MnTe. The obtained value of C11 was compared to the value obtained by the extrapolation of results corresponding to CdMnTe mixed crystals. From the frequency position of the first order FLA doublet, the index of refraction of zinc blende MnTe was also obtained. Its value was compared with the value determined by a Kramers-Kronig analysis of the reflectivity spectrum, collected on thick MnTe layer.

 

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Presentation: poster at E-MRS Fall Meeting 2004, Symposium F, by Jean-Francois Morhange
See On-line Journal of E-MRS Fall Meeting 2004

Submitted: 2004-05-14 12:48
Revised:   2009-06-08 12:55