STANDING WAVES INVESTIGATION OF INASP INP SUPERLATTICES/

X-ray standing waves measurements have been performed on a set of six InAsP/InP superlattices exhibiting a wide range of lattice strain valu es and on both the (002) and (004) reflections. The objective was to a ssess the XSW technique as a structural probe in superlattices. For sa mples with perpendicular lattice misfit less than 1.5% we find clear X SW modulations in the As fluorescence; this signal is well reproduced by simulations performed by solving the Takagi-Taupin equations. For s amples with higher misfit a negligible XSW signal is found indicating considerable lattice disorder.