Multiband conduction in Pb1-xYbxTe

Low and high field transport measurements have been performed on polycrystalline Pb1-xYbxTe obtained by the Bridgman technique. Unannealed samples show semi-insulating conduction at low temperatures while annealed samples remain conducting in the whole temperature range. The results can be explained qualitatively by impurity levels lying within the fundamental gap. Using the magnetic field-dependent Hall technique, the concentration and mobility of carriers in different bands (or sub-bands) were extracted showing the coexistence of electrons and holes. The attribution of discrete carriers to each band is discussed.