A new class of bilayer kagome lattice compounds with Dirac nodal lines and pressure-induced superconductivity

Mengzhu Shi, Fanghang Yu, Ye Yang, Fanbao Meng, Bin Lei, Yang Luo, Zhe Sun, Junfeng He, Rui Wang, Zhicheng Jiang, Zhengtai Liu, Dawei Shen, Tao Wu, Zhenyu Wang, Ziji Xiang, Jianjun Ying () and Xianhui Chen ()
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Mengzhu Shi: University of Science and Technology of China
Fanghang Yu: University of Science and Technology of China
Ye Yang: University of Science and Technology of China
Fanbao Meng: University of Science and Technology of China
Bin Lei: University of Science and Technology of China
Yang Luo: University of Science and Technology of China
Zhe Sun: University of Science and Technology of China
Junfeng He: University of Science and Technology of China
Rui Wang: Chongqing University
Zhicheng Jiang: Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences
Zhengtai Liu: Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences
Dawei Shen: Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences
Tao Wu: University of Science and Technology of China
Zhenyu Wang: University of Science and Technology of China
Ziji Xiang: University of Science and Technology of China
Jianjun Ying: University of Science and Technology of China
Xianhui Chen: University of Science and Technology of China

Nature Communications, 2022, vol. 13, issue 1, 1-7

Abstract: Abstract Kagome lattice composed of transition-metal ions provides a great opportunity to explore the intertwining between geometry, electronic orders and band topology. The discovery of multiple competing orders that connect intimately with the underlying topological band structure in nonmagnetic kagome metals AV3Sb5 (A = K, Rb, Cs) further pushes this topic to the quantum frontier. Here we report a new class of vanadium-based compounds with kagome bilayers, namely AV6Sb6 (A = K, Rb, Cs) and V6Sb4, which, together with AV3Sb5, compose a series of kagome compounds with a generic chemical formula (Am-1Sb2m)(V3Sb)n (m = 1, 2; n = 1, 2). Theoretical calculations combined with angle-resolved photoemission measurements reveal that these compounds feature Dirac nodal lines in close vicinity to the Fermi level. Pressure-induced superconductivity in AV6Sb6 further suggests promising emergent phenomena in these materials. The establishment of a new family of layered kagome materials paves the way for designer of fascinating kagome systems with diverse topological nontrivialities and collective ground states.

Date: 2022
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DOI: 10.1038/s41467-022-30442-0

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