Single crystal growth and ferromagnetism of Cr-doped Sb₄Te₃

Here we report the single crystal growth, magnetic and transport properties of Cr-doped Sb₄Te₃, (Sb_1-x Cr _x )₄Te₃, with doping concentrations x  =  0.25%, 0.5%, 0.75%, and 1%. The samples with lower doping concentrations are paramagnetic, while ferromagnetism appears in higher doped samples with the highest Curie temperature of 7 K when x  =  1%. Anomalous Hall effect with clear hysteresis loop is observed in the samples with x  =  1%, indicating the intrinsic ferromagnetism in the system. Hall resistivity measurements show the dominant charge carriers are holes and the density of holes increases with the doping concentration. This work provides a possible single-crystalline platform for further experimental researches on the nontrivial band topology in Sb₄Te₃, and enriches the ferromagnetic members in the transition metal doped (Sb₂) _m -Sb₂Te₃ topological material series.