Effect of electron irradiation on superconductivity in isovalently substituted Ba(Fe$_{1-x}$Ru$_{x}$)$_{2}$As$_2$ and SrFe$_2$(As$_{1-x}$P$_x$)$_2$

Single crystals of isovalently substituted Ba(Fe$_{1-x}$Ru$_{x}$)$_{2}$ As$_{2}$ and SrFe$_{2}$(As$_{1-x}$P$_{x}$)$_{2}$ were irradiated at $23$ K by $2.5$ MeV electrons with a total fluence up to $2\times10^{19}$ electrons per cm$^{2}$. Both the resistivity and Hall coefficient were measured before and after irradiation using the van der Pauw method. Irreversible vortex properties were probed using miniature Hall-probe arrays. We correlate the change in resistivity due to irradiation with changes in flux pinning, relaxation rate and irreversibility line. We compare the results with theoretical predictions for different pairing scenarios, including extended $s_{\pm}$.