TEMPERATURE-VARIATION OF OPTICAL-ENERGY GAP VALUES OF CD1-ZMNZIN2TE4

Measurement of optical absorption in the temperature range 20-300 K we re made on polycrystalline samples of the alloy system Cd1-zMn2In2Te4. These results were used to determine Values of the optical energy gap E(g) as a function of temperature T. The resulting curves of E(g) vs T were fitted to a simplified Manoogian-Leclerc equation and the fitte d coefficients used to give values of (dE(g)/dT)(1) and (dE(g)/dT)(2), due to lattice dilation and electron-phonon contributions, respective ly. Hence, the deformation potentials of the valence and conduction ba nds were estimated for the present compounds and alloys. (C) 1997 Else vier Science Ltd.