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

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arxiv 1302.0371 v1 pith:PDGBBXZH submitted 2013-02-02 cond-mat.mtrl-sci

H. Li , Y. R. Song , Meng-Yu Yao , Fengfeng Zhu , Canhua Liu , C. L. Gao , Jin-Feng Jia , Dong Qian
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X. Yao Y. J. Shi D. Wu
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classification cond-mat.mtrl-sci
keywords magneticcarrierdensitybi2se3bulkinsulatoriron-dopedproperties
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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$\mu$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.

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