Abstract
The kagome-lattice crystal hosts various intriguing properties including the frustrated magnetism, charge order, topological state, superconductivity and correlated phenomena. To achieve high-performance kagome-lattice compounds for electronic and spintronic applications, careful tuning of the band structure would be desired. Here, the electronic structures of kagome-lattice crystal Ni3In2S2 were investigated by transport measurements, angle-resolved photoemission spectroscopy as well as ab initio calculations. The transport measurements reveal Ni3In2S2 as a compensated semimetal with record-high carrier mobility (∼8683 and 7356 cm2 V−1 S−1 for holes and electrons) and extreme magnetoresistance (15,518% at 2 K and 13 T) among kagome-lattice materials. These extraordinary properties are well explained by its band structure with indirect gap, small electron/hole pockets and large bandwidth of the 3d electrons of Ni on the kagome lattice. This work demonstrates that the crystal field and doping serve as the key tuning knobs to optimize the transport properties in kagome-lattice crystals. Our work provides material basis and optimization routes for kagome-lattice semimetals towards electronics and spintronics applications.
摘要
具有Kagome晶格的晶体有很多有趣的性质, 包括受挫磁阻、电荷有序、拓扑态、超导和关联现象. 为了在电子学和自旋电子学应用中实现高性能Kagome晶格化合物, 需要对能带结构仔细调整. 本文采用输运测量、角分辨光电子能谱和从头计算等方法研究了Kagome晶格晶体Ni3In2S2的电子结构. 输运测量表明, Ni3In2S2是一种在Kagome晶格材料中具有创纪录的高载流子迁移率(空穴和电子迁移率分别约为8683和7356 cm2 V−1 S−1)和极大磁电阻(在2 K和13 T时为15,518%)的补偿半金属. Ni在Kagome晶格中的3d电子导致的非直接带隙、小的电子/空穴口袋和大的带宽的能带结构特征很好地解释了这些特殊的性质. 这项工作表明, 晶体场和掺杂是优化Kagome晶格晶体输运特性的关键因素. 我们的工作为Kagome晶格半金属在电子学和自旋电子学方面的应用提供了材料基础和优化路径.
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Acknowledgements
This work was supported by the National Key R&D Program of China (2017YFA0305400 and 2019YFA0704900), Chinese Academy of Sciences-Shanghai Science Research Center (CAS-SSRC-YH-2015-01) and Double First-Class Initiative Fund of ShanghaiTech University. Chen Y acknowledges the support from the Engineering and Physical Sciences Research Council Platform Grant (EP/M020517/1); Guo Y acknowledges the Major Research Plan of the National Natural Science Foundation of China (NSFC, 92065201); Chen Y and Liu Z acknowledge Shanghai Municipal Science and Technology Major Project (2018SHZDZX02); Liu E acknowledges the support from the NSFC (52088101 and 11974394), and the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (XDB33000000); Shi W acknowledges the support from Shanghai Committee of Science and Technology (22ZR1441800), Shanghai-XFEL Beamline Project (SBP) (31011505505885920161A2101001); Yang HF acknowledges the support from the NSFC (12004248) and Shanghai Sailing Program (20YF1430500); Li Y acknowledges the support from the NSFC (12104304). The calculations were carried out at the Scientific Data Analysis Platform of Center for Transformative Science and the HPC Platform of ShanghaiTech University Library and Information Services. The synchrotron-based ARPES measurement was conducted at the Beamline I05 of Diamond Light Source, and BL03U of Shanghai Synchrotron Radiation Facility. We acknowledge the Analytical Instrumentation Center of ShanghaiTech University for Laue diffraction measurements.
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Liu Z and Chen Y conceived the project; Fang H, Li Y, Xu L, and Lyu M performed the ARPES, XRD and electron transport study with the help from Yang H and Liu E; Shi W performed the theoretical calculation; Liu S and Wei L performed the STM study with the help from Wang M; Su H and Yuan J synthesized the crystals; Liu X and Yao Q performed the literature research. All authors contributed to the general discussion.
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Hongwei Fang received her BSc degree in physics from Shandong Normal University. She is currently a PhD candidate at ShanghaiTech University under the supervision of Prof. Zhongkai Liu. Her research interest focuses on studying the electronic properties of topological materials using ARPES.
Meng Lyu obtained his PhD degree from the University of Chinese Academy of Sciences. He is now a postdoctor in Prof. Enke Liu’s group at the Institute of Physics (IOP), Chinese Academy of Sciences (CAS). His research interest focuses on the exploration and study of the electrical and thermal transport properties of the magnetic topological semimetals and strongly correlated electron systems.
Wujun Shi obtained his PhD degree in physics from Nanjing University in 2013. From 2013 to 2018, he worked as Postdoctoral Research Fellow at Tsinghua University, ShanghaiTech University and Max Planck Institute for Chemical Physics of Solids (MPI-CPfS). In 2018, he joined ShanghaiTech University, and now holds the position of associate researcher. His research focuses on the electronic structure of quantum materials.
Yulin Chen is an associate professor at the Department of Physics, University of Oxford. His research interest focuses on the understanding of novel properties of quantum materials and their application. He is also interested in developing advanced ARPES instruments with new capabilities such as spin, spatial, and time resolutions.
Enke Liu obtained his PhD degree in magnetism of condensed matter physics from IOP, CAS in 2012. In the same year, he began his research career at IOP and now holds the position of Professor in physics. His research focuses on the new systems, novel states and electric/thermal transport of magnetic topological semimetals and magnetic phase-transformation materials.
Zhongkai Liu received his BSc degree in physics from Tsinghua University in 2006 and PhD degree from Stanford University in 2014. He is an associate professor at the School of Physical Science and Technology, ShanghaiTech University. His research interest focuses on characterizing the electronic structure and understanding the emergent phenomena of advanced materials with ARPES.
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The authors declare that they have no conflict of interest.
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Fang, H., Lyu, M., Su, H. et al. Record-high mobility and extreme magnetoresistance on kagome-lattice in compensated semimetal Ni3In2S2. Sci. China Mater. 66, 2032–2038 (2023). https://doi.org/10.1007/s40843-022-2348-9
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DOI: https://doi.org/10.1007/s40843-022-2348-9