Anomalous transport and ferromagnetism in the diluted magnetic semiconductor Sb2−xCrxTe3

We grew single crystals of the new dilute magnetic semiconductor p-Sb2−xCrxTe3 (x=0,0.0115,0.0215) and investigated their transport, magneto-transport and magnetic properties in the temperature interval 1.7-300 K. In high fields we clearly observed Shubnikov-de Haas oscillations, that show a decrease in hole concentration for Cr-doped samples. A negative magnetoresistance and anomalous Hall effect are observed in Cr-doped samples. Ferromagnetic order is found below the Curie temperature Tc≈5.8 K (x=0.0215) and Tc≈2.0 K (x=0.0115). In the ferromagnetic phase we observe large magnetic anisotropy with the easy-axis parallel to the C3 crystallographic axis.