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arXiv · 2011.06745

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

Brenden R. Ortiz·Samuel M. L. Teicher·Yong Hu·Julia L. Zuo·Paul M. Sarte·Emily C. Schueller·A. M. Milinda Abeykoon·Matthew J. Krogstad·Stefan Rosenkranz·Raymond Osborn·Ram Seshadri·Leon Balents·Junfeng He·Stephen D. Wilson
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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.

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Brenden R. Ortiz, Samuel M. L. Teicher, Yong Hu, Julia L. Zuo, Paul M. Sarte, Emily C. Schueller, A. M. Milinda Abeykoon, Matthew J. Krogstad, Stefan Rosenkranz, Raymond Osborn, Ram Seshadri, Leon Balents, Junfeng He, Stephen D. Wilson. 2020-11-13. CsV$_3$Sb$_5$: a $\mathbb{Z}_2$ topological kagome metal with a superconducting ground state. https://doi.org/10.1103/physrevlett.125.247002

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