论文标题
la $ _2 $ rh $ _ {3+δ} $ sb $ _4 $：一种新的三元超导恒河 - 抗抗乙酰胺
La$_2$Rh$_{3+δ}$Sb$_4$: A new ternary superconducting rhodium-antimonide
论文作者
论文摘要
含菱形的化合物提供了一个肥沃的操场，可探索具有超导性和其他奇妙电子相关效果的新型材料。通过Bi-Flux方法合成了一种新的三元恒河 - 抗抗烷$ $ _2 $ rh $ _ {3+δ} $ sb $ _4 $（$δ\ 1/8 $）。它在Orthorhombic Pr $ _2 $ ir $ _3 $ sb $ _4 $类似结构中结晶，带有空间群$ PNMA $（第62号）。晶体结构显示为堆叠二维RHSB $ _4 $ - 和RHSB $ _5 $ -POLYHEDRA网络沿$ \ Mathbf {B} $ axis，而LA原子嵌入了这些网络的空腔中。乐队结构的计算确认它是一种多频段金属，在费米级别具有货车霍夫奇异性，其状态的密度主要为RH-4 $ D $和SB-5 $ P $字符。计算还表明，冗余RH充当电荷掺杂剂。在该材料中观察到超导性，发作过渡为$ t_c^{on} \ $ 0.8k。超低温度磁化敏感性，比特定的热测量表明它是S-Wave型II型超导体。我们的工作还可能意味着宽阔的$ ln_2 $$ tm_ {3+δ} $ sb $ _4 $（$ ln $ =稀土，$ tm $ = rh，ir ...）家庭可能会在其中找到新的材料基础，其中可以找到新的超导体，量子磁磁性和其他电子相关效应。
Rhodium-containing compounds offer a fertile playground to explore novel materials with superconductivity and other fantastic electronic correlation effects. A new ternary rhodium-antimonide La$_2$Rh$_{3+δ}$Sb$_4$ ($δ\approx 1/8$) has been synthesized by a Bi-flux method. It crystallizes in the orthorhombic Pr$_2$Ir$_3$Sb$_4$-like structure, with the space group $Pnma$ (No. 62). The crystalline structure appears as stacking the two dimensional RhSb$_4$- and RhSb$_5$-polyhedra networks along $\mathbf{b}$ axis, and the La atoms embed in the cavities of these networks. Band structure calculations confirm it as a multi-band metal with a van-Hove singularity like feature at the Fermi level, whose density of states are mainly of Rh-4$d$ and Sb-5$p$ characters. The calculations also imply that the redundant Rh acts as charge dopant. Superconductivity is observed in this material with onset transition at $T_c^{on}\approx$ 0.8 K. Ultra-low temperature magnetic susceptibility and specific heat measurements suggest that it is an s-wave type-II superconductor. Our work may also imply that the broad $Ln_2$$Tm_{3+δ}$Sb$_4$ ($Ln$=Rare earth, $Tm$=Rh, Ir...) family may host new material bases where new superconductors, quantum magnetism and other electronic correlation effects could be found.
