A density-wave-like transition in the polycrystalline V₃Sb₂ sample with bilayer kagome lattice

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 bilayer lattice compound V3Sb2. The polycrystalline V3Sb2 samples were synthesized by conventional solid-state-reaction method in sealed quartz tube at temperatures below 850 Celsius degree. Measurements magnetic susceptibility resistivity revealed consistently density-wave-like transition Tdw ~ 160 K with large thermal hysteresis, even though some sample-dependent behaviors are observed presumably due different preparation conditions. Upon cooling through Tdw, no strong anomaly parameters indication symmetry lowering detected powder x-ray diffraction measurements. This can be suppressed completely applying hydrostatic pressures about 1.8 GPa, around which sign superconductivity is down 1.5 K. Specific-heat measurements reveal relatively Sommerfeld coefficient {\gamma} = 18.5 mJ/mol-K2, confirming metallic ground state moderate electronic correlations. Density functional theory calculations indicate that shows non-trivial crystalline property. Thus, our study makes new candidate interplay between density-wave-order, nontrivial band topology, possible superconductivity.