Recently,transition-metal-based kagome metals have aroused much research interest as a novel platform to explore exotic topological quantum phenomena.Here we report on the synthesis,structure,and physical properties of a bilayer kagome lattice compound V3Sb2.The polycrystalline V3Sb2 samples were synthesized by conventional solid-state-reaction method in a sealed quartz tube at temperatures below 850 ℃.Measurements of magnetic susceptibility and resistivity re-vealed consistently a density-wave-like transition at Tdw ≈ 160 K with a large thermal hysteresis,even though some sample-dependent behaviors were observed presumably due to the different preparation conditions.Upon cooling through Tdw,no strong anomaly in lattice parameters and no indication of symmetry lowering were detected in powder x-ray diffraction measurements.This transition can be suppressed completely by applying hydrostatic pressures of about 1.8 GPa,around which no sign of superconductivity was observed down to 1.5 K.Specific-heat measurements revealed a relatively large Sommerfeld coefficient γ =18.5 mJ.mol-1.K-2,confirming the metallic ground state with moderate electronic correla-tions.Density functional theory calculations indicate that V3Sb2 shows a non-trivial topological crystalline property.Thus,our study makes V3 Sb2 a new candidate of metallic kagome compound to study the interplay between density-wave-order,nontrivial band topology,and possible superconductivity.

Ningning Wang;Yuhao Gu;M.A.McGuire;Jiaqiang Yan;Lifen Shi;Qi Cui;Keyu Chen;Yuxin Wang;Hua Zhang;Huaixin Yang;Xiaoli Dong;Kun Jiang;Jiangping Hu;Bosen Wang;Jianping Sun;Jinguang Cheng

Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100190,China;Materials Science and Technology Division,Oak Ridge National Laboratory,Oak Ridge,Tennessee 37831,USA

中国物理B（英文版）

[1]Ningning Wang;Yuhao Gu;M.A.McGuire;Jiaqiang Yan;Lifen Shi;Qi Cui;Keyu Chen;Yuxin Wang;Hua Zhang;Huaixin Yang;Xiaoli Dong;Kun Jiang;Jiangping Hu;Bosen Wang;Jianping Sun;Jinguang Cheng-.A density-wave-like transition in the polycrystalline V3Sb2 sample with bilayer kagome lattice)[J].中国物理B（英文版）,2022(01):17-26

V3Sb2,Tdw

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