We report on the effects of 3.5 MeV proton irradiation in RbCa2Fe4As4F2, an iron-based superconductor with unusual properties in between those of the pnictides and of the cuprate high-temperature superconductors. We studied how structural disorder introduced by ion bombardment affects the critical temperature, superfluid density and gap values by combining a coplanar waveguide resonator technique, electric transport measurements and point-contact Andreev-reflection spectroscopy. We find an unusually weak dependence of the superconducting properties on the amount of disorder in this material when compared to other iron-based superconductors under comparable irradiation conditions. The nodal multigap state exhibited by pristine RbCa2Fe4As4F2 is also robust against proton irradiation, with a two-band d−d model being the one that best fits the experimental data.
@article{arxiv.2401.08279,
title = {Unusually weak irradiation effects in anisotropic iron-based superconductor RbCa2Fe4As4F2},
author = {Daniele Torsello and Erik Piatti and Michela Fracasso and Roberto Gerbaldo and Laura Gozzelino and Xiaolei Yi and Xiangzhuo Xing and Zhixiang Shi and Dario Daghero and Gianluca Ghigo},
journal= {arXiv preprint arXiv:2401.08279},
year = {2024}
}