CsV3Sb5: A Z2 Topological Kagome Metal with a Superconducting Ground State
CsV3Sb5: A Z2 Topological Kagome Metal with a Superconducting Ground State
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DOI：
10.1103/physrevlett.125.247002
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发表时间：
2020-12-10
影响因子：
8.6
通讯作者：
Wilson, Stephen D.
中科院分区：
文献类型：
--
作者：
Ortiz, Brenden R.;Teicher, Samuel M. L.;Wilson, Stephen D.
最近发现的姊妹化合物KV 3Sb 5和RbV 3Sb 5，CsV 3Sb 5结晶与理想的kagome网络的钒和锑层分离的碱金属离子。本文介绍了CsV_3Sb_5的电子性质，证明了其在Tc = 2.5K的单晶中的体超导性。通过角分辨光电子能谱和密度泛函理论研究了CsV 3Sb 5的正常态电子结构，将CsV 3Sb 5归类为Z（2）拓扑金属。多个受保护的狄拉克交叉预测在接近费米能级（E-F），正常状态的相关效应的签名也建议由高温电荷密度波动不稳定性。在这种材料中的非常规超导性的形成的影响进行了讨论。
Recently discovered alongside its sister compounds KV3Sb5 and RbV3Sb5, CsV3Sb5 crystallizes with an ideal kagome network of vanadium and antimonene layers separated by alkali metal ions. This work presents the electronic properties of CsV3Sb5, 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 and density-functional theory, which categorize CsV3Sb5 as a 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 wavelike instability. The implications for the formation of unconventional superconductivity in this material are discussed.