SUPPRESSION OF THE AUGER RECOMBINATION DUE TO SPIN POLARIZATION OF EXCESS CARRIERS AND MN2+ IONS IN THE SEMIMAGNETIC SEMICONDUCTOR CD0.95MN0.05S

The observation of a strong increase in the photoconductivity of Cd0.9 5Mn0.05S under an applied magnetic field is reported. The effect, obse rved at low temperatures, is explained to arise due to the dramatic su ppression of the Anger recombination processes involving the excitatio n of Mn2+ ions ((6)A(1)-->T-4(1(2)) transitions within a 3d shell). Th e single-ion-assisted Anger recombination, which determines the lifeti me of the excess carriers at low magnetic fields, become forbidden for the totally spin-polarized single ions, and at high magnetic field th e cluster-assisted Auger recombination dominates.