UDK 539.21:537.86
TRANSPORT PROPERTIES IN SOLID SOLUTIONS RexMn1-xS (Re = Ce, Yb)
A. M. Kharkov, M. N. Sitnikov
Reshetnev Siberian State Aerospace University 31, Krasnoyarsky Rabochy Av., Krasnoyarsk, 660037, Russian Federation
The paper describes the materials on the basis of solid solutions CexMn1-xS and YbxMn1-xS, which could potentially be used as sensors, sensor devices, and read-write information. A sharp peak in the electrical resistivity in solid solutions CexMn1-xS is discovered, the temperature is shifted to lower temperatures with increasing cerium concentration. The crossover temperature from the tunnel to the activation conductivity type is found. Anomalies in transport properties are explained by turning octahedral and energy levels shift t2g states of electrons with orbital angular momentum. Shift resistivity high temperature samples CexMn1-xS in the magnetic field for the two formulations and the electrical resistance increase for x = 0.05 in a magnetic field is installed. The growth of the magnetoresistance of the currentvoltage characteristics with increasing concentration is found. The dependence of the magnetoresistance of the current is installed. These effects are caused by the change of orbital angular correlations of electrons in a magnetic field. The substitution of manganese ions in YbxMn1-xS rare earth element Yb with variable valence keeps semiconductor type conductivity in the concentration range 0 < x <0.25. The change of the activation energy on heating in a temperature range of 380 K < T < 440 K for all formulations is established. The electrons of the impurity levels in the conduction band to produce a solid solution YbxMn1-xS have been found to decrease the activation energy. Magnetoresistance change sign from negative to positive when heated in YbxMn1-xS at 0.1 ≤ x ≤ 0.2 is established. The critical temperature above which magnetoresistance disappears is determined.
Keywords: solid solutions, electrical resistivity, magnetoresistance, current-voltage characteristics, magnetoresistive effect.
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Kharkov Anton Mikhailovich – Cand. Sc., docent of Department of Physics, Reshetnev Siberian State Aerospace

University. E-mail: khark.anton@mail.ru.

Sitnikov Maxim Nikolaevich – Cand. Sc., senior teacher, Department of Physics, Reshetnev Siberian State

Aerospace University. E-mail: kineru@mail.ru.