Pressure dependence of the absorption edge for Cd 1- xMn xTe
Abstract
The effect of pressure on the optical absorption edge of mixed crystals Cd 1- xMn xTe with different manganese concentrations is reported. The observed absorption edge shifts to higher energy with increasing pressure at a rate of α=7-8×10 -3 eV/kbar and a second order coefficient of β=-4×10 -5 eV/kbar 2 for x<0.5, to lower energy with increasing pressure at a rate of α=-5.0 ×10 -3 eV/kbar for x⩾0.5. A phase transition occurs for all the samples studied. The absorption edge of the new phase is outside the wavenumber range of the instrument. The physical origins of different pressure coefficients are discussed in the light of the deformation potentials of energy band states and the hybridization of the Mn 2+ 3 d levels with the p-like states in the valence band.
- Publication:
-
Solid State Communications
- Pub Date:
- August 1985
- DOI:
- 10.1016/0038-1098(85)90853-1
- Bibcode:
- 1985SSCom..55..475S