论文标题
在Cu-和Au掺杂的BAFE2AS2的压力下，具有TC = 7 K的超导性
Superconductivity with Tc=7 K under pressure for Cu-, and Au-doped BaFe2As2
论文作者
论文摘要
值得注意的是，具有贵族元素Cu和au的Bafe2AS2（122）的化学取代具有最大TC = 3 K的超导性，而AG替代（AG-122）则保持抗fiferromagnetic。对于BA（Fe1-XTMX）2AS2，TM = Cu，Au或Ag，并且通过掺杂量x = 0.04，所有TM掺杂剂的a-lattice参数略微增加（0.4％），而c-lattice则cu（-0.2％）降低（-0.2％）tm = cu，tm = cu，niplye（0.05％）的AU，AGES（0.2％），均增加（0.2％）。尽管人们对第11组的贵族元素的态度态度幼稚，应同样影响122个量子特性，但它们会产生与基态特征扩展的显着差异。对于AG-122晶体，只有丝状超导性的证据被压力注明。但是，对于Au和Cu掺杂（X = 0.03），我们发现超导性的大幅改善，TC分别增加到7 K和7.5 K，在20 kbar的压力下。与环境压力的结果一样，掺杂剂的身份对基态性质具有重大影响。密度功能理论的计算证实了这些结果，并找到了Au和Ag掺杂剂强电子散射的证据，而Cu对122电子结构的破坏性较小。
It is noteworthy that chemical substitution of BaFe2As2 (122) with the noble elements Cu and Au gives superconductivity with a maximum Tc=3 K, while Ag substitution (Ag-122) stays antiferromagnetic. For Ba(Fe1-xTMx)2As2, TM= Cu, Au, or Ag, and by doping an amount of x=0.04, a-lattice parameter slightly increases (0.4%) for all TM dopants, while c-lattice decreases (-0.2%) for TM=Cu, barely moves (0.05%) for Au, and increases (0.2%) for Ag. Despite the naive expectation that the noble elements of group 11 should affect the quantum properties of 122 similarly, they produce significant differences extending to the character of the ground state. For the Ag-122 crystal, evidence of only a filamentary superconductivity is noted with pressure. However, for Au and Cu doping (x=0.03) we find a substantial improvement in the superconductivity, with Tc increasing to 7 K and 7.5 K, respectively, under 20 kbar of pressure. As with the ambient pressure results, the identity of the dopant therefore has a substantial impact on the ground state properties. Density functional theory calculations corroborate these results and find evidence of strong electronic scattering for Au and Ag dopants, while Cu is comparatively less disruptive to the 122 electronic structure.
