Abstract
High-resolution Brillouin spectroscopy experiments were carried out to determine the velocity of surface acoustic waves (SAW) as a function of composition in GaAs1−xNx/GaAs(100) epilayers (0<x<0.037) grown by organometallic vapor phase epitaxy. Experimental data were analyzed using simulations of surface acoustic wave velocities. For all compositions investigated, SAW velocity measurements in both the [100] and [110] crystallographic directions are in close agreement with values predicted assuming linearly interpolated elastic constants between those of GaAs and GaN.
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