Tuning the transport and magnetism in a Cr–Bi2Se3 topological insulator by Sb doping

Y. Tung; C. W. Chong; C. W. Liao; C. H. Chang; S. Y. Huang; P. Y. Chuang; M. K. Lee; C. M. Cheng; Y. C. Li; C. P. Liu; J. C. A. Huang

doi:10.1039/C7RA08201K

Tuning the transport and magnetism in a Cr–Bi₂Se₃ topological insulator by Sb doping†

Y. Tung,‡^a C. W. Chong,‡*^a C. W. Liao,^a C. H. Chang,^a S. Y. Huang,^a P. Y. Chuang,^a M. K. Lee,^b C. M. Cheng,^c Y. C. Li,^d C. P. Liu

^d and J. C. A. Huang

*^aef

Author affiliations

* Corresponding authors

^a Department of Physics, National Cheng Kung University, Tainan 70101, Taiwan
E-mail: cheongwei2000@yahoo.com, jcahuang@mail.ncku.edu.tw

^b NSC Instrument Center at NCKU, Tainan 70101, Taiwan

^c National Synchrotron Radiation Research Center, Hsinchu 300, Taiwan

^d Department of Materials Science and Engineering, National Cheng Kung University, Tainan 70101, Taiwan

^e Advanced Optoelectronic Technology Center (AOTC), National Cheng Kung University, Tainan 70101, Taiwan

^f Taiwan Consortium of Emergent Crystalline Materials (TCECM), Ministry of Science and Technology, Taipei 10622, Taiwan

Abstract

High-quality crystalline (Cr,Sb)-doped Bi₂Se₃ (Cr-BSS) films were synthesized using molecular beam epitaxy (MBE). The effect of Cr- and Sb-doping on the transport and magnetic properties of Cr-BSS films was systematically investigated. The sheet carrier density N_2D was found to be reduced to ∼6 × 10¹² cm⁻² in this quaternary compound at room temperature. This has not previously been observed in a Cr–Bi₂Se₃-based magnetic topological insulator (TI). Moreover, owing to the Sb dopants, the weak localization (WL)-like positive magnetoconductance in magnetic Cr–Bi₂Se₃ (Cr-BS) was enhanced. The enhancement is attributed to the emergence of ferromagnetism, as evidenced from the field-dependent Hall resistance and magnetic moment. The obvious tunable electrical and magnetic properties by the Sb dopant in this system are well suited for applications based on magnetic TI devices.

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Tuning the transport and magnetism in a Cr–Bi₂Se₃ topological insulator by Sb doping†

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Tuning the transport and magnetism in a Cr–Bi₂Se₃ topological insulator by Sb doping

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