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

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  
【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.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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