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We report resistance and elastoresistance measurements on(Ba$_{0.5}$K$_{0.5}$)Fe$_2$As$_2$, CaKFe$_4$As$_4$, andKCa$_2$Fe$_4$As$_4$F$_2$. The Fe-site symmetry is $D_{2d}$ in the firstcompound 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 resistanceand elastoresistance is similar between the three compounds. Especially, the[110] elastoresistance is enhanced with decreasing temperature irrespective ofthe Fe-site symmetry. This appears to be in conflict with recent Ramanscattering studies on CaKFe$_4$As$_4$, which suggest the absence of nematicfluctuations. We consider possible ways of reconciliation and suggest that thepresent result is important in elucidating the origin of in-plane resistivityanisotropy in iron-based superconductors.

Elastoresistance measurements on CaKFe$_4$As$_4$ and KCa$_2$Fe$_4$As$_4$F$_2$ with the Fe site of $C_{2v}$ symmetry