Optical properties and magnetic ordering of ternary magnetic semiconductor Zn1-xMn2+xAs2

The optical properties of the single crystals of the ternary compounds Zn_1-xMn_2+xAs₂ and Mg₂MnAs₂ have been studied. The “red” and “blue” shifts of optical absorption edge for Zn_1-xMn_2+xAs₂, were established. At the same time no anomaly of the forbidden gap temperature dependence for Mg₂MnAs₂ was observed which shows a usual “blue” shift. An attempt has been made to interpret these facts in relation to the magnetic properties of the compounds.