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We report on the effects of 3.5 MeV proton irradiation inRbCa$_2$Fe$_4$As$_4$F$_2$, an iron-based superconductor with unusual propertiesin between those of the pnictides and of the cuprate high-temperaturesuperconductors. We studied how structural disorder introduced by ionbombardment affects the critical temperature, superfluid density and gap valuesby combining a coplanar waveguide resonator technique, electric transportmeasurements and point-contact Andreev-reflection spectroscopy. We find anunusually weak dependence of the superconducting properties on the amount ofdisorder in this material when compared to other iron-based superconductorsunder comparable irradiation conditions. The nodal multigap state exhibited bypristine RbCa$_2$Fe$_4$As$_4$F$_2$ is also robust against proton irradiation,with a two-band $d-d$ model being the one that best fits the experimental data.

Unusually weak irradiation effects in anisotropic iron-based superconductor RbCa2Fe4As4F2