ABSTRACT
Infrared photoluminescence (PL) has been investigated in Hg1-xMnxTe (MMT) single crystals for MnTe mole fractions (x) covering the range where the effective g-factor (geff) changes the sign (x=0.104-0.202). The behaviour of the PL feature assigned to electron-holeplasma transitions was examined for temperatures in the 5-70 K range and for magnetic fields up to 7T for both Faraday and Voigt geometries. With increasing magnetic field the PL signal magnitude grows getting a maximum at B=Bmax ≈ 2.3 T and then decreases, approaching the noise level at about 5 T (for x=0.104). A strong narrowing of PL peak is observed for all samples investigated in the magnetic field. A modified Pidgeon-Brown model was successfully applied for describing the magnetic field dependencies of the emission lines for x=0.104 but fails for x=0.167 and 0.202. The exchange interaction parameters are obtained by fitting the data to be N0β = 0.9 and N0α = -0.45.
