Effect of the magnetic order on the optical-absorption edge inCd1−xMnxTe

The effect of the magnetic order on the optical-absorption edge of the semiconductor ${\mathrm{Cd}}_{1\mathrm{-}\mathrm{x}}$ ${\mathrm{Mn}}_{\mathrm{x}}$Te is studied. A magnetic blue shift is observed when the temperature decreases below the Néel temperature. This effect is not affected by the magnetic order at low temperature. With the analysis of the experimental data, it is proposed that the exchange interaction gives rise to a red shift of the absorption edge. This phenomenon, however, decreases with temperature to such an extent that an extra blue shift appears at low temperatures.