Thermoelectric power and Shubnikov-de Haas effect in magnetic impurity-doped Bi2Te3 and Bi2Se3

Abstract Shubnikov-de Haas and Hall effect measurements were carried out on the diluted magnetic semiconductors p-Bi2−xFexTe3 and n-Bi2−xFexSe3. By increasing the Fe content, the hole concentration decreases in p-Bi2−xFexTe3, while the electron concentration increases in n-Bi2−xFexSe3. This demonstrates that iron atoms act as donors in both type of materials. The Seebeck coefficient α increases in p-Bi2−xFexTe3 with increasing Fe content, while it decreases in n-Bi2−xFexSe3.