论文标题
一个灯笼的非中心对称超导体la $ _4 $$ TX $（$ t $ = ru，rh，ir; $ x $ = al，in）
A Family of Lanthanide Noncentrosymmetric Superconductors La$_4$$TX$ ($T$ = Ru, Rh, Ir; $X$ = Al, In)
论文作者
论文摘要
我们报告了一系列非中心对称化合物la $ _4 $$ TX $（$ t $ = ru，rh，ir; $ x $ = al，in）中的超导性发现，它们具有带有太空群体$ f \ bar {4} 3M $的立方晶体结构。 la $ _4 $ rual，la $ _4 $ rhal，la $ _4 $ _4 $ iral，la $ _4 $ _4 $ ruin and la $ _4 $ iRIN展示散装的超导过渡，具有临界温度$ t_c $ t_c $ of 1.77 k，3.05 k，3.05 k，1.54 k，1.54 k，0.58 k，0.58 k和0.93 k，分别是0.93 k。 LA $ _4 $$ T $ Al化合物的特定热量与具有完全开放的超导差距的$ S $波型一致。在所有情况下，上临界场均由Werthamer-Helfand-Hohenberg模型很好地描述，并且该值远低于Pauli极限，表明轨道限制是主要的配对机制。密度功能理论（DFT）计算表明，反对称自旋轨耦合（ASOC）的带状裂片程度显示不同化合物之间的差异很大。这表明在这一系列的超导体中，ASOC的强度高度可调，这表明这些是检查ASOC和非中心超对象超导体中ASOC和超导性能之间关系的良好候选者。
We report the discovery of superconductivity in a series of noncentrosymmetric compounds La$_4$$TX$ ($T$ = Ru, Rh, Ir; $X$ = Al, In), which have a cubic crystal structure with space group $F\bar{4}3m$. La$_4$RuAl, La$_4$RhAl, La$_4$IrAl, La$_4$RuIn and La$_4$IrIn exhibit bulk superconducting transitions with critical temperatures $T_c$ of 1.77 K, 3.05 K, 1.54 K, 0.58 K and 0.93 K, respectively. The specific heat of the La$_4$$T$Al compounds are consistent with an $s$-wave model with a fully open superconducting gap. In all cases, the upper critical fields are well described by the Werthamer-Helfand-Hohenberg model, and the values are well below the Pauli limit, indicating that orbital limiting is the dominant pair-breaking mechanism. Density functional theory (DFT) calculations reveal that the degree of band splitting by the antisymmetric spin-orbit coupling (ASOC) shows considerable variation between the different compounds. This indicates that the strength of the ASOC is highly tunable across this series of superconductors, suggesting that these are good candidates for examining the relationship between the ASOC and superconducting properties in noncentrosymmetric superconductors.
