论文标题
重孔的弹性掺杂122个铁皮剂超导体
Elastoresistivity of heavily hole doped 122 iron pnictides superconductors
论文作者
论文摘要
在重孔的pnictide超导体中，源自源性仍然存在争议。在RBFE $ _2 $中宣布了巨大的nematic波动，甚至远离磁性不稳定的夜间订单为$ _2 $及其姐妹化合物。在这里，我们报告了一系列的Isovalent和电子兴奋剂KFE $ _2 $的系统弹性研究为$ _2 $ Crystals。我们在冷却沿其[110]方向的所有晶体时发现了发散的弹性抗性。如果k用较大的离子代替，或者系统向LIFSHITZ过渡驱动，则弹性弹性的幅度会有所不同。但是，我们得出的结论都不一定表明一个独立的列表临界点。取而代之的是，增加的nematicition可以与另一个电子临界性相关联。特别是，我们提出了一种机制，如何在LIFSHITZ过渡时如何增强弹性性。
Nematicity in the heavily hole-doped iron pnictide superconductors remains controversial. Sizeable nematic fluctuations and even nematic orders far from a magnetic instability were declared in RbFe$_2$As$_2$ and its sister compounds. Here we report a systematic elastoresistance study of series of isovalent- and electron-doped KFe$_2$As$_2$ crystals. We found divergent elastoresistance upon cooling for all the crystals along their [110] direction. The amplitude of elastoresistivity diverges if K is substituted with larger ions or if the system is driven towards a Lifshitz transition. However, we conclude none of them necessarily indicates an independent nematic critical point. Instead, the increased nematicity can be associated with another electronic criticality. In particular, we propose a mechanism how elastoresistivity is enhanced at a Lifshitz transition.
