Anomalous transport and ferromagnetism in the diluted magnetic semiconductor Sb2− x Cr x Te3

Abstract: We grew single crystals of the new dilute magnetic semiconductor p-Sb2− x Cr x Te3 (x=0,0.0115,0.0215) and investigated their transport, magneto-transport and magnetic properties in the temperature interval 1.7 – 300K. 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 T c≈5.8K (x=0.0215) and T c≈2.0K (x=0.0115). In the ferromagnetic phase we observe large magnetic anisotropy with the easy-axis parallel to the C 3 crystallographic axis. [Copyright &y& Elsevier]