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In the novel stoichiometric iron-based material RbEuFe$_{4}$As$_{4}$superconductivity coexists with a peculiar long-range magnetic order of Eu 4fstates. Using angle-resolved photoemission spectroscopy, we reveal a complexthree dimensional electronic structure and compare it with density functionaltheory calculations. Multiple superconducting gaps were measured on varioussheets of the Fermi surface. High resolution resonant photoemissionspectroscopy reveals magnetic order of the Eu 4f states deep into thesuperconducting phase. Both the absolute values and the anisotropy of thesuperconducting gaps are remarkably similar to the sibling compound without Eu,indicating that Eu magnetism does not affect the pairing of electrons. Acomplete decoupling between Fe- and Eu-derived states was established fromtheir evolution with temperature, thus unambiguously demonstrating thatsuperconducting and a long range magnetic orders exist independently from eachother. The established electronic structure of RbEuFe$_{4}$As$_{4}$ opensopportunities for the future studies of the highly unorthodox electron pairingand phase competition in this family of iron-based superconductors with doping.

When superconductivity does not fear magnetism: Insight into electronic structure of RbEuFe$_{4}$As$_{4}$