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The Zn 1−x Mn x Te 1−y O y alloy was prepared using a rapid crystallization technique. X-ray diffraction measurements were used to estimate the oxygen doping level. It is demonstrated that the oxygen solubility in Zn 1−x Mn x Te 1−y O y alloys greatly depends on the manganese concentration. No oxygen related effects were observed in the manganese free samples. The highest value of the oxygen molar fraction (y) achieved in the present study was 0.0023 in a sample having manganese fraction (x) of 0.056. The decrease in the alloy band gap was observed with increasing oxygen content. The oxygen-related trap level in Zn1−xMnxTe1−yOy was found to be strongly shifted with respect to that in ZnTe 1−y O y . The shift is assigned to the creation of complex (Mn x O) traps.

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We present preliminary studies of magnetic and transport properties of Ge 1−x−y Sn x Mn y Te mixed crystals with 0.091 ≤ x ≤ 0.105 and 0.012 ≤ y ≤ 0.115. Qualitative analysis of our experimental results showed the appearance of a spin-glass phase at T < 50 K. The transport characterization (resistivity and Hall effect measurements) showed that the investigated samples had semimetallic p-type conductivity with relatively large carrier concentrations (p > 10 21 cm −3 ) and low mobilities (µ < 100 cm 2 V −1 s −1 ). The dependence of transport properties on the chemical composition of the samples was observed.