ETUDE DES PHONONS DANS LES MELANGES Mn_x Cd_1-x Te PAR DIFFUSION RAMAN ET ABSORPTION INFRAROUGE

Optical Characterization of MBE-Grown Cd1-xMnxTe Layers by Raman Spectroscopy

“…Resulting LO-and TO-frequencies as a function of Mn concentration correspond well to the previously reported data obtained for bulk crystals in the composition range 0 < x < 0.7 from the infrared reflectivity [4,5] and Raman scattering measurements [6,7]. Slightly non-linear dependence of the "MnTe-like" LO mode on the mixed crystal composition (suggested by a part of the previous data) is confirmed.…”

“…Frequencies of these excitations depend on the mixed crystal composition. In particular, LO phonon frequency for "MnTe-like" branch changes almost linearly with an increasing amount of Mn in the layer [4][5][6][7]. Thus, such LO frequency value can be also used for the crystal composition determination.…”

Polarized far infrared magnetoplasmon reflectivity of doped CdxMn1–xTe semimagnetic semiconductor in the Voigt configuration

“…The results of the MREI calculation are presented in Table 1 and are in agreement with existing infrared reflectivity data [10,11] and Raman scattering results [3,4,12,13]. According to the MREI model, a ternary alloy A and n h = 2 10 17 cm -3 .…”

“…Also, there is considerable current interest in these materials because they appear to have great potential for use in spintronics or in non-volatile computer memory. The modified random element isodisplacement (MREI) model developed by Chang and Mitra [1] and modified by Genzel et al [2] for ternary mixed crystals has been applied successfully to describe the phonon behavior and the influence of composition on the mode behavior of the optical phonons in ternary alloys [3][4][5][6]. Basically optical phonons always play an important role in determining many physical properties in these materials.…”