Abstract
The magnetic susceptibility (χ) of crystals of (Bi2 − xSbx)Te3 (0 < x < 1) solid solutions has been measured at temperatures from 2 to 400 K. The χ of the crystals containing 10 and 25 mol % Sb2Te3 increases with temperature in the range 50 to 220 K, where the Hall coefficient of Bi2Te3 increases anomalously. The increase in diamagnetic susceptibility and Hall coefficient with temperature is shown to be caused by a reduction in light-hole concentration, accompanied by a decrease in light-hole effective mass. With increasing Sb2Te3 content, the shape of the χ(T) curve changes as a consequence of changes in band structure, which increase the influence of heavy, paramagnetic holes.
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