【摘 要】
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We report the structure and physical properties of two newly discovered compounds AV8Sb12 and AV6Sb6 (A =Cs,Rb),which have C2 (space group:Cmrnrn) and C3 (space group:R3m) symmetry,respectively.The basic V-kagome unit appears in both compounds,but stackin
【机 构】
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Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sci
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We report the structure and physical properties of two newly discovered compounds AV8Sb12 and AV6Sb6 (A =Cs,Rb),which have C2 (space group:Cmrnrn) and C3 (space group:R3m) symmetry,respectively.The basic V-kagome unit appears in both compounds,but stacking differently.A V2Sb2 layer is sandwiched between two V3Sb5 layers in AV8Sb12,altering the V-kagome lattice and lowering the symmetry of kagome layer from hexagonal to orthorhombic.In AV6Sb6,the building block is a more complex slab made up of two half-V3Sb5 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 1021 em-3.No superconductivity has been observed in CsV8Sb12 above 0.3 K under in situ pressure up to 46 GPa.Compared to CsV3Sb5,theoretical calculations and angle-resolved photoemission spectroscopy reveal a quasi-two-dimensional electronic structure in CsV8Sb12 with C2 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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