论文标题
kagomélinalsrbti $ _3 $ bi $ _5 $和CSTI $ _3 $ bi $ _5 $
The kagomé metals RbTi$_3$Bi$_5$ and CsTi$_3$Bi$_5$
论文作者
论文摘要
kagomé金属rbti $ _3 $ bi $ _5 $和CSTI $ _3 $ bi $ _5 $通过加热元素的氩气气氛和使用自变量方法而生长的单晶，将既合成为polycrystalline粉末。在同型上，化合物在六边形晶体系统中结晶至kv $ _3 $ _3 $ sb $ _5 $（p6/mmm，z = 1，csti3bi5：a = 5.7873（1）Å，ac，c = 9.2062（1）Å; rbti3bi5：rbti3bi5：a = 5.7773（1）1）钛原子形成一个kagomé网，在六角形以及三角形上方和下方和下方和下方都有二晶原子。碱金属原子由12个二雄原子协调，并形成Alb $ _2 $的平板，在Kagomé层之间。用CSTI $ _3 $ bi $ _5 $和RBTI $ _3 $ _3 $ _5 $单晶显示了Pauli-Paramagnetism和由CSBI $ _2 $ _2 $/rbbbi $ _2 $ Indrucity引起的超导率的磁化敏感性测量结果。磁转运测量结果揭示了传统的费米液体行为和量子振荡，指示在低温下单个显性轨道。 DFT计算显示了与CSV $ _3 $ _3 $ SB $ _5 $相似的特征性金属Kagomé乐队结构，并减少了带填充。对频带结构的对称分析并未揭示非平凡拓扑的明显和独特的特征。
The kagomé metals RbTi$_3$Bi$_5$ and CsTi$_3$Bi$_5$ were synthesized both as polycrystalline powders by heating the elements an argon atmosphere and as single crystals grown using a self-flux method. The compounds crystallize in the hexagonal crystal system isotypically to KV$_3$Sb$_5$ (P6/mmm, Z = 1, CsTi3Bi5: a = 5.7873(1) Å, c = 9.2062(1) Å; RbTi3Bi5: a = 5.773(1) Å, c = 9.065(1) Å). Titanium atoms form a kagomé net with bismuth atoms in the hexagons as well as above and below the triangles. The alkali metal atoms are coordinated by 12 bismuth atoms and form AlB$_2$-like slabs between the kagomé layers. Magnetic susceptibility measurements with CsTi$_3$Bi$_5$ and RbTi$_3$Bi$_5$ single crystals reveal Pauli-paramagnetism and traces of superconductivity caused by CsBi$_2$/RbBi$_2$ impurities. Magnetotransport measurements reveal conventional Fermi liquid behavior and quantum oscillations indicative of a single dominant orbit at low temperature. DFT calculations show the characteristic metallic kagomé band structure similar to that of CsV$_3$Sb$_5$ with reduced band filling. A symmetry analysis of the band structure does not reveal an obvious and unique signature of a nontrivial topology.
