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

Journal Article · 01 January 2022 · Chinese Physics B

DOI: https://doi.org/10.1088/1674-1056/ac4227 · OSTI ID:1843690

Wang, Ningning ^[1]; Gu, Yuhao ^[1]; McGuire, Michael A.  ^[2]; Yan, Jiaqiang  ^[2]; Shi, Lifen ^[1]; Cui, Qi ^[1]; Chen, Keyu ^[1]; Wang, Yuxin ^[1]; Zhang, Hua ^[1]; Yang, Huaixin ^[1]; Dong, Xiaoli ^[1]; Jiang, Kun ^[1]; Hu, Jiangping ^[1]; Wang, Bosen ^[1]; Sun, Jianping ^[1]; Cheng, Jinguang ^[1]

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1. Chinese Academy of Sciences (CAS), Beijing (China); University of Chinese Academy of Sciences, Beijing (China)
2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

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 °C. Measurements of magnetic susceptibility and resistivity revealed consistently a density-wave-like transition at T_dw ≈ 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 T_dw, 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 correlations. Density functional theory calculations indicate that V₃Sb₂ shows a non-trivial topological crystalline property. Furthermore, our study makes V₃Sb₂ a new candidate of metallic kagome compound to study the interplay between density-wave-order, nontrivial band topology, and possible superconductivity.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES)
• Grant/Contract Number: AC05-00OR22725
• OSTI ID: 1843690
• Journal Information: Chinese Physics B, Journal Name: Chinese Physics B Journal Issue: 1 Vol. 31; ISSN 1674-1056
• Publisher: IOP PublishingCopyright Statement
• Country of Publication: United States
• Language: English