Abstract
Kinetic phenomena in the Pb0.5Sn0.5Te solid solution have been studied in wide ranges of concentrations and temperatures in the case of two types of acceptor doping: with overstoichiometric tellurium and with a combination of equal amounts of Na and Te atoms; in the latter case, two additives amounting to 1.0 and 1.5 at % of each element have been used. Hole densities attained in this case significantly exceeded the largest values corresponding to the Pb0.5Sn0.5 Te:Te samples. For both types of acceptors, the hole concentration in the solid solution is found to be a factor of 2 higher than in PbTe with the same level of doping. The specific features of behavior of the Hall coefficient, thermopower, and electrical conductivity are interpreted in the context of a model of a single-valence-band spe ctrum with a wide band of resonant levels. The mechanism of formation of resonant levels in PbTe and Pb0.5Sn0.5 Te solid solutions is discussed.
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