论文标题
Muon-Spin放松研究的分层Kagome超导体CSV $ _3 $ SB $ _5 $
Muon-spin relaxation study of the layered kagome superconductor CsV$_3$Sb$_5$
论文作者
论文摘要
$ {\ mathbb {z}} _ {2} $拓扑金属$ r $ v $ _3 $ _3 $ sb $ _5 $（$ r $ = k，rb，cs，cs）具有分层的kagome结构，提供了一个独特的机会，可以在充电订单，超级导管和拓扑之间进行研究之间的相互作用。在这里，我们报告了Muon-Spin松弛/旋转（$μ$ SR）的测量值在CSV $ _3 $ _3 $ SB $ _5 $上在广泛的温度范围内进行，以发现该材料中电荷密度波顺序和超导性的性质。从零场$μ$ sr中，我们发现自发磁场出现在50 K以下，远低于电荷密度波转换（$ t^* \ sim 93 $ k）。我们表明，这些自发的领域本质上是动态的，因此很难将它们与隐藏的静态顺序联系起来。 CSV $ _3 $ SB $ _5 $的超导状态被发现可以保留时间反转对称性，而横向场$μ$ $ SR结果与具有两个完全开放差距的超导状态一致。
The ${\mathbb{Z}}_{2}$ topological metals $R$V$_3$Sb$_5$ ($R$ = K, Rb, Cs) with a layered kagome structure provide a unique opportunity to investigate the interplay between charge order, superconductivity and topology. Here, we report muon-spin relaxation/rotation ($μ$SR) measurements performed on CsV$_3$Sb$_5$ across a broad temperature range, in order to uncover the nature of the charge-density wave order and superconductivity in this material. From zero-field $μ$SR, we find that spontaneous magnetic fields appear below 50 K which is well below the charge-density wave transition ($T^* \sim 93$ K). We show that these spontaneous fields are dynamic in nature making it difficult to associate them with a hidden static order. The superconducting state of CsV$_3$Sb$_5$ is found to preserve time-reversal symmetry and the transverse-field $μ$SR results are consistent with a superconducting state that has two fully open gaps.
