  In the novel stoichiometric iron-based material RbEuFe4As4 superconductivity
coexists with a peculiar long-range magnetic order of Eu 4f states; their
coexistance is puzzling and represents a challenge for both experiment and
theory. Using angle-resolved photoemission spectroscopy, resonant photoemission
spectroscopy, Andreev reflection spectroscopy and scanning tunneling
spectroscopy we have addressed this puzzle and unambigously shown that Fe- and
Eu-derived states are largely decoupled and that superconducting and a long
range magnetic orders exist almost independently from each other.
