LARGE LATTICE DISTORTION INDUCED BY MN-2+ EXCITATION IN CD1-XMNXTE

Photoluminescence spectra of Mn2+-related transition assigned as 4T1-6A1 in Cd1-xMnxTe (x=0.4 to 0.7) are investigated in a temperature range from 10 K to 220 K and under hydrostatic pressures up to 20 kbar. The observed temperature dependence of the spectral width shows that in the low-temperature region (10 K to 80 K) a configuration coordinate model is adopted, but in the high-temperature region, using the model, there is deviation from the calculated results. We consider that the equilibrium position Q0 in the excited states changes toward that in the ground state increasing temperature above 80 K. In addition, anomalous behavior in the temperature dependence of the pressure coefficient of the luminescence peak energy is observed at about 80 K, which is related to the change of Q0.