Emerging weak antilocalization effect in Ta0.7Nb0.3Sb2 semimetal single crystals

doi:10.1007/s11467-022-1198-6

Frontiers of Physics

2023, Vol. 18

Issue (1): 13304 https://doi.org/10.1007/s11467-022-1198-6

本期目录

Emerging weak antilocalization effect in Ta_0.7Nb_0.3Sb₂semimetal single crystals

Meng Xu^1,², Lei Guo²(

), Lei Chen³, Ying Zhang⁴, Shuang-Shuang Li⁴, Weiyao Zhao⁵(

), Xiaolin Wang⁶, Shuai Dong², Ren-Kui Zheng⁴(

)

¹. College of Science, Hohai University, Nanjing 210098, China
². School of Physics, Southeast University, Nanjing 211189, China
³. School of Physics and Materials Science, Guangzhou University, Guangzhou 510006, China
⁴. School of Materials Science and Engineering, Jiangxi Engineering Laboratory for Advanced Functional Thin Films, Nanchang University, Nanchang 330031, China
⁵. Department of Materials Science & Engineering, Monash University, Clayton 3800 VIC, Australia
⁶. Institute for Superconducting and Electronic Materials, & ARC Centre of Excellence in Future Low-Energy Electronics Technologies, Innovation Campus, University of Wollongong, North Wollongong NSW 2500, Australia

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Abstract：

Weak antilocalization (WAL) effect is commonly observed in low-dimensional systems, three-dimensional (3D) topological insulators and semimetals. Here, we report the growth of high-quality Ta_0.7Nb_0.3Sb₂ single crystals via the chemical vapor transport (CVT). Clear sign of the WAL effect is observed below 50 K, probably due to the strong spin−orbital coupling in 3D bulk. In addition, it is worth noting that a relatively large MR of 120% appears under 1 T magnetic field at T = 2 K. Hall measurements and two-band model fitting results reveal high carrier mobility (>1000 cm²·V⁻¹·s⁻¹ in 2–300 K region), and off-compensation electron/hole ratio of ~8:1. Due to the angular dependence of the WAL effect and the fermiology of the Ta_0.7Nb_0.3Sb₂ crystals, interesting magnetic-field-induced changes of the symmetry of the anisotropic magnetoresistance (MR) from two-fold (≤ 0.6 T) to four-fold (0.8–1.5 T) and finally to two-fold (≥ 2 T) are observed. This phenomenon is attributed to the mechanism shift from the low-field WAL dominated MR to WAL and fermiology co-dominated MR and finally to high-field fermiology dominated MR. All these signs indicate that Ta_0.7Nb_0.3Sb₂ may be a topological semimetal candidate, and these magnetotransport properties may attract more theoretical and experimental exploration of the (Ta,Nb)Sb₂ family.

Key words： topological semimetal magnetoresistance weak antilocalization effect spin−orbital coupling

收稿日期: 2022-04-02 出版日期: 2022-11-30

Corresponding Author(s): Lei Guo,Weiyao Zhao,Ren-Kui Zheng

引用本文:

. [J]. Frontiers of Physics, 2023, 18(1): 13304.
Meng Xu, Lei Guo, Lei Chen, Ying Zhang, Shuang-Shuang Li, Weiyao Zhao, Xiaolin Wang, Shuai Dong, Ren-Kui Zheng. Emerging weak antilocalization effect in Ta_0.7Nb_0.3Sb₂semimetal single crystals. Front. Phys. , 2023, 18(1): 13304.

链接本文:

https://academic.hep.com.cn/fop/CN/10.1007/s11467-022-1198-6
https://academic.hep.com.cn/fop/CN/Y2023/V18/I1/13304

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