Discovery of Two Families of VSb-Based Compounds with V-Kagome Lattice  

作　　者：Yuxin Yang Wenhui Fan Qinghua Zhang Zhaoxu Chen Xu Chen Tianping Ying Xianxin Wu Xiaofan Yang Fanqi Meng Gang Li Shiyan Li Lin Gu Tian Qian Andreas PSchnyder Jian-gang Guo Xiaolong Chen 杨雨欣;樊文辉;张庆华;陈昭旭;陈旭;应天平;吴贤新;杨小帆;孟繁琦;李岗;李世燕;谷林;钱天;Andreas P.Schnyder;郭建刚;陈小龙(Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;Max-Planck-Institut für Festkörperforschung,Heisenbergstrasse 1,D-70569 Stuttgart,Germany;State Key Laboratory of Surface Physics,Department of Physics,Fudan University,Shanghai 200438,China;School of Materials,Tsinghua University,Beijing 100084,China;Songshan Lake Materials Laboratory,Dongguan 523808,China)

机构地区：[1]Beijing National Laboratory for Condensed Matter Physics,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]Max-Planck-Institut für Festkörperforschung,Heisenbergstrasse 1,D-70569 Stuttgart,Germany [4]State Key Laboratory of Surface Physics,Department of Physics,Fudan University,Shanghai 200438,China [5]School of Materials,Tsinghua University,Beijing 100084,China [6]Songshan Lake Materials Laboratory,Dongguan 523808,China

出　　处：《Chinese Physics Letters》2021年第12期44-49,共6页中国物理快报（英文版）

基　　金：Supported by the National Key Research and Development Program of China(Grant Nos.2017YFA0304700 and 2018YFE0202601);the National Natural Science Foundation of China(Grant Nos.51922105,51772322,52025025,and 52072400);the Beijing Natural Science Foundation(Grant No.Z200005)。

摘　　要：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:R3 m)symmetry,respectively.The basic Vkagome unit appears in both compounds,but stacking differently.AV_(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.

关 键 词：SYMMETRY LATTICE HEXAGONAL 

分 类 号：TB34[一般工业技术—材料科学与工程]