LOCALIZED EXCITON MAGNETIC POLARONS IN CD1-XMNXTE

Using the method of selective excitation of the exciton luminescence i n Cd1-xMnxTe epilayers we have measured energies of localized magnetic polarons (LMP's) for alloys with manganese mole fractions x less-than -or-equal-to 0.34. The suppression of the LMP energy has been studied in external magnetic fields and with temperature increase. Polaron for mation times and exciton lifetimes have been measured by time-resolved photoluminescence. We have found that in alloys with x < 0.17 the pol aron formation process is interrupted by exciton recombination and, as a result, the LMP does not reach its equilibrium energy. This dynamic al effect on the polaron energy together with the strong sensitivity o f the LMP formation to the conditions of primary exciton localization causes the absence of the LMP formation in layers with x < 0.1. Antife rromagnetic clustering of Mn ions, which leads to the spin-glass phase formation at low temperatures, affects the polaron energy and results in the increasing stability of LMP's against suppression by temperatu re increase and magnetic fields. InCd1-xMnxTe with x > 0.20 a consider able part of the polaron energy is controlled by the input of clusters of antiferromagnetically coupled Mn spins located in the nonuniform m olecular field of localized excitons. The comparison of the exciton Ze eman splitting and the LMP magnetic-field suppression provides insight into the internal structure of LMP's.