Abstract
Thermoelectric power was studied in semimagnetic (diluted magnetic) Pb 1− x−y Sn y Mn x Te ( x=0.12, y=0.72) semiconductor in the temperature range T=10–100 K covering both ferromagnetic and paramagnetic range of temperatures of this material. In addition to standard diffusion contribution to the thermoelectric power ( α D∝ T), we found in PbSnMnTe an additional “magnetic” contribution ( α FM). Employing the effect of carrier-concentration-controlled ferromagnetism in PbSnMnTe, we demonstrate that the temperature dependence of α FM( T) shows a clear maximum at the ferromagnetic Curie temperature. This experimental finding is discussed in terms of Kasuya model for the thermoelectric properties of diluted magnetic metallic systems with sd-exchange interaction.
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