论文标题
基于钛的Kagome超导体CSTI_3BI_5和拓扑状态
Titanium-based kagome superconductor CsTi_3Bi_5 and topological states
论文作者
论文摘要
自从发现新的基于钒的Kagome超导体AV3SB5（A = K，RB和CS）具有拓扑带结构的新家族以来，已经致力于探索超导状态和相互交织的命令的起源。同时，寻找具有新型物理特性和较高超导过渡温度的新型超导体类型一直是超导体研究史上的主要线索。在这里，我们报告了基于钛金属CSTI3BI5（CT3B5）晶体的成功制造和拓扑状态。生长的CT3B5晶体具有高质量，拥有完美的二维kagome钛网。 CT3B5晶体的超导性表明，临界温度TC为〜4.8K。第一原则计算预测CT3B5具有强大的拓扑表面状态，这意味着CT3B5是Z2拓扑Kagome kagome kagome超导管器。这一发现提供了一种新型的超导体，也是探索Kagome超导体中超导性和拓扑状态的起源的基础。
Since the discovery of a new family of vanadium-based kagome superconductor AV3Sb5 (A=K, Rb, and Cs) with topological band structures, extensive effort has been devoted to exploring the origin of superconducting states and the intertwined orders. Meanwhile, searching for new types of superconductors with novel physical properties and higher superconducting transition temperatures has always been a major thread in the history of superconductor research. Here we report a successful fabrication and the topological states of a Titanium-based kagome metal CsTi3Bi5 (CT3B5) crystal. The as-grown CT3B5 crystal is of high quality and possesses a perfect two-dimensional kagome net of Titanium. The superconductivity of the CT3B5 crystal shows that the critical temperature Tc is of ~4.8 K. First-principle calculations predict that the CT3B5 has robust topological surface states, implying that CT3B5 is a Z2 topological kagome superconductor. This finding provides a new type of superconductors and the base for exploring the origin of superconductivity and topological states in kagome superconductors.
