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Far-infrared reflection studies in ordered GaInP 2

1997; American Physical Society; Volume: 56; Issue: 20 Linguagem: Inglês

10.1103/physrevb.56.13126

1095-3795

F. Alsina, Hyeonsik Cheong, J.D. Webb, A. Mascarenhas, John F. Geisz, J. M. Olson,

Phase-change materials and chalcogenides

We report on room-temperature polarized far-infrared reflectance in partially ordered GaInP performed with the incidence plane parallel to the growth and ordering directions. Measurements in the $s$-polarization geometry show only one feature related to the vibrations in the plane of ordering. On the contrary, those performed using $p$ polarization display a structure appearing in the range of InP-like vibrations as the order parameter increases, which we relate to a resonance with longitudinal-optic mode character due to the anisotropy of the longitudinal phonons.