Infrared dielectric dispersion of ZnGeP2 and CdGeP2 |
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Authors: | A Miller GD Holah WC Clark |
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Institution: | Department of Physics, Heriot-Watt University, Edinburgh, U.K. |
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Abstract: | The polarised i.r. reflectivity spectra of single crystals of the non-linear chalcopyrite materials ZnGeP2 and CdGeP2 have been measured over the spectral range 40–700 cm?1. Analysis of the spectra using classical dispersion theory and the Kramers-Krönig technique has yielded, in each material, five modes with frequencies between 80 and 385 cm?1 with the polarisation perpendicular to the optic axis. Parallel to the optic axis, two modes have been observed with frequencies between 300 and 400 cm?1. The phonon dispersion curves of the isoelectronic analogue GaP have been used, together with a group theoretical analysis, to assign specific atomic displacements to the observed modes. |
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