| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Tunable colossal negative magnetoresistance of topological semimetal EuB6 thin sheets |
| Ke Zhu(祝轲)1,2,†, Qi Qi(齐琦)1,2,†, Yaofeng Xie(谢耀锋)1,2, Lulu Pan(潘禄禄)1, Senhao Lv(吕森浩)1, Guojing Hu(胡国静)1, Zhen Zhao(赵振)1, Guoyu Xian(冼国裕)3, Yechao Han(韩烨超)2, Lihong Bao(鲍丽宏)1,2,3, Ying Zhang(张颖)1,2, Xiao Lin(林晓)2, Hui Guo(郭辉)1,2, Haitao Yang(杨海涛)1,2,‡, and Hong-Jun Gao(高鸿钧)1,2,§ |
1 Beijing National Center for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
3 Songshan Lake Materials Laboratory, Dongguan 523808, China |
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Abstract EuB$_{6}$, a magnetic topological semimetal, has attracted considerable attention in recent years due to its rich intriguing physical properties, including a colossal negative magnetoresistance (CNMR) ratio exceeding $-80%$, a topological phase transition and a predicted quantum anomalous Hall effect (QAHE) approaching the two-dimensional (2D) limit. Yet, studies of the influence of the dimensionality approaching 2D on the electronic transport properties of EuB$_{6}$ are still scarce. In this work, EuB$_{6}$ thin sheets with thicknesses ranging from 35 μm to 180 μm were successfully fabricated through careful mechanical polishing of high-quality EuB$_{6}$ single crystals. The reduced thickness, temperature and magnetic field have a strong influence on the electronic transport properties, including the CNMR and carrier concentration of EuB$_{6}$ thin sheets. As the thickness of EuB$_{6}$ thin sheets decreases from 180 μm to 35 μm, the magnetization transition temperature and the corresponding suppressing temperature of the Kondo effect decrease from 15.2 K to 10.9 K, while the CNMR ratio increases from $-87.2%$ to $-90.8%$. Furthermore, the weak antilocalization effect transits to a weak localization effect and the carrier concentration increases by 9.4% at 30 K in a 35 μm EuB$_{6}$ thin sheet compared to the value reported for a 180 μm thin sheet. Our findings demonstrate an obvious tunable effect of the reduced dimensionality on the transport properties of EuB$_{6}$ along with the temperature and magnetic field, which could provide a route to exploring the QAHE near the 2D limit in EuB$_{6}$ and other topological semimetals.
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Received: 07 March 2025
Revised: 22 April 2025
Accepted manuscript online: 08 May 2025
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PACS:
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73.23.-b
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(Electronic transport in mesoscopic systems)
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| Fund: Project supported by the National Key R&D Program of China (Grant No. 2022YFA1204100), the National Natural Science Foundation of China (Grant No. 62488201), the Chinese Academy of Sciences (Grant Nos. XDB33030000 and YSBR-053), and Innovation Program of Quantum Science and Technology (Grant No. 2021ZD0302700). |
Corresponding Authors:
Haitao Yang, Hong-Jun Gao
E-mail: htyang@iphy.ac.cn;hjgao@iphy.ac.cn
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Cite this article:
Ke Zhu(祝轲), Qi Qi(齐琦), Yaofeng Xie(谢耀锋), Lulu Pan(潘禄禄), Senhao Lv(吕森浩), Guojing Hu(胡国静), Zhen Zhao(赵振), Guoyu Xian(冼国裕), Yechao Han(韩烨超), Lihong Bao(鲍丽宏), Ying Zhang(张颖), Xiao Lin(林晓), Hui Guo(郭辉), Haitao Yang(杨海涛), and Hong-Jun Gao(高鸿钧) Tunable colossal negative magnetoresistance of topological semimetal EuB6 thin sheets 2025 Chin. Phys. B 34 097308
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