Lattice Vibration Spectra of Zn_xCd_<1-x>Te Alloys

概要

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Reststrahlen reflectivities and localized vibration modes due to light impurities have been measured on Zn_xCd_<1-x>Te alloys. Each reflection spectrum of these alloys exhibits clear "two-mode" behavior and shows no complex fine structure. Therefore, the theoretical analysis of the spectra can be done relatively easily and simply by developing a modified random-element-isodisplacement model. The localized vibrations of impurities (S, Mg, Be) in Zn_xCd_<1-x>Te are explained by a model of the charged particles in a static parabolic potential well being affected by the local conditions in the alloy lattice. The constants assumed in the analysis of the reflectivity spectra are consistent with the data in the localized vibrations. Considering these results, a criterion has been proposed to determine whether a certain mixed crystal will exhibit "one-mode" or "two-mode" behavior.
社団法人日本物理学会の論文
1972-06-05