Influence of local magnetization on acceptor-bound complex state in Hg1-xMnxTe single crystals

We performed temperature-dependent magnetic measurements and infrared photoluminescence (PL) measurements in various geometries on a series of p-type Hg1-xMnxTe single crystals (0.20 <= x <= 0.26). Evolution of PL features was observed, and zero-field spin splitting was identified for the acceptor-bound magnetic polaron (A(0)BMP). The results show direct evidence for local spontaneous magnetization of the A(0)BMP. Comparison with the Ditel-Spalek model indicates that besides the fluctuation and collective regimes, the A(0)BMP exhibits a new regime at low temperatures owing to the formation of the spin-glass state in Hg1-xMnxTe. The dissociation energy of the exciton bound to the A(0)BMP ((A(0),X) BMP) varied rapidly with temperature, and the ratio of the dissociation energy of the (A(0),X) BMP to the binding energy of the A(0)BMP was larger than the classical value of the A(0)X and no longer a constant, which breaks the Haynes rule. The free exciton localization process helps enhance the local magnetization of the (A(0),X) BMP by transferring energy from the carrier system to the Mn-spin system, and it may lead to a photoinduced configuration of non-interacting ferromagnetic domains or the photoinduced magnetization effect. (C) 2015 AIP Publishing LLC.