CsV${}_3$Sb${}_5$: a ${\mathbb{Z}}_2$ topological kagome metal with a superconducting ground state

Abstract

Recently discovered alongside its sister compounds KV${}_3$Sb${}_5$ and RbV${}_3$Sb${}_5$, CsV${}_3$Sb${}_5$ crystallizes with an ideal kagome network of vanadium and antimonene layers separated by alkali metal ions. This work presents the electronic properties of CsV${}_3$Sb${}_5$, demonstrating bulk superconductivity in single crystals with a T${}_c=2.5$K. The normal state electronic structure is studied via angle-resolved photoemission spectroscopy (ARPES) and density functional theory (DFT), which categorize CsV${}_3$Sb${}_5$ as a ${\mathbb{Z}}_2$ topological metal. Multiple protected Dirac crossings are predicted in close proximity to the Fermi level ($E_F$), and signatures of normal state correlation effects are also suggested by a high temperature charge density wave-like instability. The implications for the formation of unconventional superconductivity in this material are discussed.

6 pages, 4 figures

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• Topological Insulators with Inversion Symmetry
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Cited by in corpus (6)

• Superconductivity in the ${\mathbb{Z}}_2$ kagome metal KV${}_3$Sb${}_5$
• Superconductivity and normal-state properties of kagome metal RbV3Sb5 single crystals
• Highly-robust reentrant superconductivity in CsV3Sb5 under pressure
• Absence of local moments in the kagome metal KV3Sb5 as determined by muon spin spectroscopy
• Anisotropic superconducting properties of Kagome metal CsV3Sb5
• Tuning the flat bands of the kagome metal CoSn with Fe, In, or Ni doping