Additional and canonical phonon modes inHg1−xCdxTe(0.06≤x≤0.7)

In this experimental work a conception of the phonon spectra of the ${\text{Hg}}_{1\ensuremath{-}x}{\text{Cd}}_{x}\text{Te}(x=0.06--0.7)$ solid solution is presented which explains the presence of additional lines in the region $100--115\text{ }{\text{cm}}^{\ensuremath{-}1}$. Data of the optical reflectivity measurements obtained in far and middle infrared regions for eleven compositions of these alloys in the temperature range from 20 to 293 K using the synchrotron radiation ($\text{DA}\ensuremath{\Phi}\text{NE}$-LIGHT in LNF, Italy) as source are analyzed. Analyses were performed on samples of different types ($n$ and $p$ type) of conductivity as well as the temperature dependences of the line intensity under consideration in the region from 70 to $118\text{ }{\text{cm}}^{\ensuremath{-}1}$. The model of two valley potential of the mercury atom in the ${\text{Hg}}_{1\ensuremath{-}x}{\text{Cd}}_{x}\text{Te}$ lattice is used for interpretation of the additional phonon modes.