论文标题
SR1-XNAXFE2AS2超导体中的短范围列表波动
Short-range nematic fluctuations in Sr1-xNaxFe2As2 superconductors
论文作者
论文摘要
列型波动，磁顺序和超导性之间的相互作用对于铁基超导体物理是至关重要的。在这里，我们在孔掺杂的SR $ _ {1-x} $ na $ _x $ _x $ fe $ _2 $中报道平面内横向声音子，作为通过非弹性X射线散射测得的$ _2 $，并提取列的敏感性和列明相关长度。通过一种独立的分析方法，对于含有磁性的四方阶段（$ x = 0.36 $）的样本（$ x = 0.36 $），我们发现它具有短的列表相关长度$ξ$ 〜10 $ 〜10 $Å$和大型的nematic敏感性$χ_{\ rm nem nem} $。最佳掺杂（$ x = 0.55 $）样本表现出较弱的声子软化效果，这表明$ξ$和$χ_ {\ rm nem} $既减少了。我们的结果表明，短距离列的波动可能有利于超导性，重点是理解基于铁的超导体的列神经相关长度。
Interactions between nematic fluctuations, magnetic order and superconductivity are central to the physics of iron-based superconductors. Here we report on in-plane transverse acoustic phonons in hole-doped Sr$_{1-x}$Na$_x$Fe$_2$As$_2$ measured via inelastic X-ray scattering, and extract both the nematic susceptibility and the nematic correlation length. By a self-contained method of analysis, for the underdoped ($x=0.36$) sample, which harbors a magnetically-ordered tetragonal phase, we find it hosts a short nematic correlation length $ξ$ ~ 10 $Å$ and a large nematic susceptibility $χ_{\rm nem}$. The optimal-doped ($x=0.55$) sample exhibits weaker phonon softening effects, indicative of both reduced $ξ$ and $χ_{\rm nem}$. Our results suggest short-range nematic fluctuations may favor superconductivity, placing emphasis on the nematic correlation length for understanding the iron-based superconductors.
