Pressure Effect on Spin Exchange Interaction between Excitons and Magnetic Ions in a CdTe/Cd1-x Mn x Te Single Quantum Well Structure

Photoluminescence (PL) measurements in a CdTe/Cd_1-xMn_xTe (x=0.24) single quantum well (SQW) structure with different quantum well (QW) widths and bulk Cd_1-xMn_xTe (x=0.15) under high hydrostatic pressures up to 2.68 GPa and DC magnetic fields up to 30 T are reported. We analyze the Zeeman shift of the band-edge exciton PL peaks, taking into account a linear magnetization term, and obtain pressure dependence of spin exchange parameters. Negative pressure dependence of the sp-d exchange constant is found in the system with higher Mn concentration. A possibility that the hybridization is weakened due to pressure induced relaxation of the strain in the Mn-Te-Mn bonds is proposed.