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

• 作者: 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
• 来源期刊: 中国物理B（英文版）
• 年，卷（期）: 2022,（1）
• 所属期刊栏目: SPECIAL TOPIC—Superconductivity in vanadium-based kagome materials
• 页码范围: 17-26
• 页数: 10页
• 语种: 英文
• DOI: 10.1088/1674-1056/ac4227

摘要

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.