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

摘要

We grew single crystals of the new dilute magnetic semiconductor p-Sb2-xCrxTe3 (x = 0, 0.0115, 0.0215) and investigated their transport, magneto-tran sport 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 magneto resistance and anomalous Hall effect are observed in Cr-doped samples. Ferromagnetic order is found below the Curie temperature T-c approximate to 5.8 K (x = 0.0215) and T-c approximate to 2.0 K (x = 0.0115). In the ferromagnetic phase we observe large magnetic anisotropy with the easy-axis parallel to the C-3 crystallographic axis. (c) 2005 Elsevier B.V. All rights reserved.