The temperature and concentration dependences of the charge carrier mobility in PbTe-MnTe solid solutions

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Abstract
The temperature dependences of conductivity (σ), the Hall coefficient (R H), and the charge carrier mobility (μH) for cast and pressed samples of PbTe-MnTe solid solutions (0–2.5 mol % of MnTe) were studied in the temperature range of 80–300 K. The mobility of cast samples varies only slightly in the temperature range of 80–140 K. At higher temperatures, μH decreases according to the power law μH=aT −v . The mobility μH of pressed samples exponentially increases with temperature in the temperature range of 100–160 K, which is related to the energy barriers ΔE a formed by oxide films at the grain boundaries. The dependences of μH, ν, and ΔE a on the MnTe content have anomalies in the composition range of 0.75–1.25 mol %, which are related to the concentration phase transition of the percolation type.