The results of measurements of electrical resistivity without a field and in magnetic field of 0.8 T in the temperature range 100 K < T < 450 K for compositionYbxMn1-xS with x = 0.05, 0.1 are presented. For the x = 0.05 the gigantic magnetoresistive effect at room temperature is found.
In a solid solution of HoxMn1-xS, the magnitude of the electric charge versus the voltage is investigated in a quasi-stationary electric field at frequencies of 0.003 Hz, 0.01 Hz and 0.1 Hz in the temperature range of 80-500 K. The temperature intervals phase synchronism of current and voltage are established. The temperatures of extremes with the maximum electric charge in the sample HoxMn1-xS are found.
The thermoelectric properties of compounds with variable valence Mn1-ХReХS (0 ≤ X ≤ 0.2) in the temperature range of (80 – 1100) K are studied. The maxima on the temperature dependences of the Seebeck coefficient (thermal EMF) for all substitution concentrations and the change of the sign of the Seebeck coefficient from positive to negative with an increase in the substitution concentration in Mn1-XYbXS are determined. A model of impurity donor 4f-states is proposed and a satisfactory agreement with the data on the thermal EMF is obtained.
The effect of electron doping in LuxMn1-xS and cationic vacancies in Mn0.9S manganese sulfide on the formation of phonon modes of vibration, the type of conductivity, and the impedance characteristics is studied. The IR spectra in the frequency range 450-7500 cm−1, the I-V in the temperature range 300-500 K, and the impedance in the frequency range 102-106 Hz were measured. The qualitative difference in the temperature behavior of the impedance, the activation character of the relaxation time, and the change in the activation energy of the impurity conductivity in LuxMn1-xS at high temperatures are found.
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