Optical properties and plasmon – Two different phonons coupling in ZnGeAs2 + Mn

Optical properties of p-type Zn1−xMnxGeAs2 for 0 ⩽ x ⩽ 0.078 were investigated by Raman spectroscopy at room temperature. Phonons of ZnGeAs2 are experimentally determined and they are in excellent agreement with those theoretically predicted. Existence of MnAs clusters was confirmed in the sample with the highest concentration of Mn. MnAs was found in α and β phases and their vibrational frequencies are obtained experimentally. Plasmon – two different phonons interaction in Zn1−xMnxGeAs2 is registered and analyzed.

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► Raman spectra of Zn1−xMnxGeAs2 at room temperature were investigated.
► Existence of α and β MnAs clusters was confirmed.
► Vibrational frequencies of these materials were obtained experimentally.
► Plasmon – two different phonons interaction in Zn1−xMnxGeAs2 was analyzed.