Spontaneous ordering in GaInP2: A polarized-piezomodulated-reflectivity study.

Piezomodulated reflectivity is used to probe the electronic structure of GaInP[sub 2] epilayers grown by organometallic chemical-vapor epitaxy on misoriented [001] GaAs substrates. The epilayers, grown at different growth temperatures using 2[degree] and 6[degree] misoriented substrates, exhibit various degrees of ordering. Our study provides information on the fundamental gap, crystal-field splitting, and spin-orbit splitting for temperatures ranging from 6 to 250 K.