Discovery of Two Families of VSb-Based Compounds with V-Kagome Lattice
Yuxin Yang1,2†, Wenhui Fan1,2†, Qinghua Zhang1†, Zhaoxu Chen1,2, Xu Chen1,2, Tianping Ying1*, Xianxin Wu3, Xiaofan Yang4, Fanqi Meng5, Gang Li1,6, Shiyan Li4, Lin Gu1,6, Tian Qian1,6, Andreas P. Schnyder3, Jian-gang Guo1,6*, and Xiaolong Chen1,6*
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China 2School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China 3Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany 4State Key Laboratory of Surface Physics, Department of Physics, Fudan University, Shanghai 200438, China 5School of Materials, Tsinghua University, Beijing 100084, China 6Songshan Lake Materials Laboratory, Dongguan 523808, China
Abstract：We report the structure and physical properties of two newly discovered compounds AV$_{8}$Sb$_{12}$ and AV$_{6}$Sb$_{6}$ (A = Cs, Rb), which have $C_{2}$ (space group: $Cmmm$) and $C_{3}$ (space group: $R\bar{3}m$) symmetry, respectively. The basic V-kagome unit appears in both compounds, but stacking differently. A V$_{2}$Sb$_{2}$ layer is sandwiched between two V$_{3}$Sb$_{5}$ layers in AV$_{8}$Sb$_{12}$, altering the V-kagome lattice and lowering the symmetry of kagome layer from hexagonal to orthorhombic. In AV$_{6}$Sb$_{6}$, the building block is a more complex slab made up of two half-V$_{3}$Sb$_{5}$ layers that are intercalated by Cs cations along the $c$-axis. Transport property measurements demonstrate that both compounds are nonmagnetic metals, with carrier concentrations at around $10^{21}$ cm$^{-3}$. No superconductivity has been observed in CsV$_{8}$Sb$_{12}$ above 0.3 K under in situ pressure up to 46 GPa. Compared to CsV$_{3}$Sb$_{5}$, theoretical calculations and angle-resolved photoemission spectroscopy reveal a quasi-two-dimensional electronic structure in CsV$_{8}$Sb$_{12}$ with $C_{2}$ symmetry and no van Hove singularities near the Fermi level. Our findings will stimulate more research into V-based kagome quantum materials.
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2021, Vol. 38 
