Abstract
In this paper, the experimental studies of magnetic-field and temperature dependences of the magnetization of HgSe:Fe crystals with the iron concentrations 2×1018 cm−3≤NFe≤3×1019 cm−3 are carried out. It has been found that at helium temperatures the quantum oscillations of the magnetization are observed for all samples in the magnetic fields H ≥ 15 kOe, whose amplitude decreases monotonically with increasing the temperature up to T = 25 K due to the thermal smearing of the Fermi level. The effective area of extreme sections of the Fermi surface is defined and the concentration of collectivized electrons under conditions of the Fermi level stabilization at the resonant donor level of the iron is estimated. For the first time, the spin splitting of the Landau levels in the quantum oscillations of the de Haas - van Alphen has been revealed at the concentration of the iron impurity within the limits of 7×1018cm−3<NFe<2×1019cm−3. The critical impurity concentration has been determined at which there is a sharp increase in the Curie-Weiss temperature, indicating the occurrence of spontaneous spin polarization of the hybridized electron states in the mercury selenide doped with an iron.
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