Some Aspects of Raman Scattering in Cd3As2 Single Crystals

Abstract

Raman scattering measurements in the tetragonal Cd3As2 single crystals are carried out at temperatures of 300 and 77 K. The spectra obtained are interpreted in terms of phonon-electron and electron-electron interactions. The features in the low-frequency interval are due to contributions from phonon and single particle scattering. The electronic RS involving intra- and interband excitations is dominant at frequencies higher than 80 cm−1. The resonant enhancement of the band at 300 cm−1 arises from the incident light frequency being in the vicinity of ∑1 – ∑4. La diffusion Raman dans les mono-cristaux de Cd3As2 quadratique a ete etudiee a 300 et 77 K. Leg spectres Raman obtenus sont interpretes en termes des interactions un phonon–electron et electron–electron. Des spectres en region de basses frequences sont attribues a la diffusion a un phonon et a une particule. Cependant la diffusion Raman faisant intervenir des excitations electroniques intra- et interbandes est dominant aux frequences au-dessus de 80 cm−1. Une croissance resonante d'une bande a 300 cm−1 resulte du voisinage des energies de raie incidente et un seuil d'excitation ∑1 – ∑4.