The temperature dependence of resistivity, magnetization, and electron-spin resonance of the ␣-MnS single crystal were measured in temperature range of 5 K Ͻ T Ͻ 550 K. Magnetization hysteresis in an applied magnetic field up to 0.7 T at T = 5, 77, and 300 K, irreversible temperature behavior of magnetization, and resistivity were found. The obtained data were explained in terms of a degenerate tight binding model using random phase approximation. The contribution of holes in t 2g and e g bands of manganese ions to the conductivity, optical absorbtion spectra, and charge instability in ␣-MnS were studied. Charge susceptibility maxima resulted from the competition of the on-site Coulomb interaction between the holes in different orbitals and small hybridization of subbands were calculated at T = 160, 250, and 475 K.
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