Carrier density dependence of the magnetic properties in iron-doped Bi2Se3 topological insulator

cond-mat.mtrl-sci

/ Authors

H. Li, Y. R. Song, Meng-Yu Yao, Fengfeng Zhu, Canhua Liu, C. L. Gao, Jin-Feng Jia, Dong Qian, X. Yao, Y. J. Shi

and 1 more author

/ Abstract

The electronic and magnetic properties of iron-doped topological insulator Bi1.84-xFe0.16CaxSe3 single crystals were studied. By co-doping Fe and Ca atoms, ferromagnetic bulk states with different carrier density (from n-type to p-type) were obtained. Effective magnetic moments for each Fe atom was estimated as small as about 0.07$μ$B. Magnetic and non-magnetic phases separation was observed in all samples. Our results suggest that the bulk ferromagnetism in Fe-doped Bi2Se3 is not intrinsic and regardless of carrier density.