论文标题
cakfe $ _4 $上的弹性测量值$ _4 $和kca $ _2 $ _2 $ fe $ _4 $ as $ _4 $ f $ _2 $ a $ c_ {2v} $对称性
Elastoresistance measurements on CaKFe$_4$As$_4$ and KCa$_2$Fe$_4$As$_4$F$_2$ with the Fe site of $C_{2v}$ symmetry
论文作者
论文摘要
我们报告（Ba $ _ {0.5} $ K $ _ {0.5} $）Fe $ _2 $ AS $ _2 $，CAKFE $ _4 $ as $ _4 $，以及KCA $ _2 $ _2 $ _2 $ _4 $ _4 $ as $ _4 $ f $ _2 $ _2 $。在第一个化合物中，Fe-Site对称性为$ d_ {2d} $，但后两个中的$ c_ {2v} $，它提高了Fe $ d_ {xz} $和$ d_ {yz} $ orbitals的退化。这三种化合物之间的电阻和弹性的温度依赖性相似。尤其是，随着温度的降低，[110]弹性均可以增强。这似乎与最近对Cakfe $ _4 $ as $ _4 $的Raman散射研究发生冲突，这表明缺乏列表波动。我们考虑了可能的和解方式，并建议目前的结果对于阐明铁基超导体中平面电阻率各向异性的起源很重要。
We report resistance and elastoresistance measurements on (Ba$_{0.5}$K$_{0.5}$)Fe$_2$As$_2$, CaKFe$_4$As$_4$, and KCa$_2$Fe$_4$As$_4$F$_2$. The Fe-site symmetry is $D_{2d}$ in the first compound but $C_{2v}$ in the latter two, which lifts the degeneracy of the Fe $d_{xz}$ and $d_{yz}$ orbitals. The temperature dependence of the resistance and elastoresistance is similar between the three compounds. Especially, the [110] elastoresistance is enhanced with decreasing temperature irrespective of the Fe-site symmetry. This appears to be in conflict with recent Raman scattering studies on CaKFe$_4$As$_4$, which suggest the absence of nematic fluctuations. We consider possible ways of reconciliation and suggest that the present result is important in elucidating the origin of in-plane resistivity anisotropy in iron-based superconductors.
