Novel magnetic stoichiometric superconductor EuRbFe4As4

Authors :: Kim, T. K.
Pervakov, K. S.
Vlasenko, V. A.
Sadakov, A. V.
Usoltsev, A. S.
Evtushinsky, D. V.
Jung, S. W.
Poelchen, G.
Kummer, K.
Roditchev, D.
Stolyarov, V. S.
Golovchanskiy, I. A.
Vyalikh, D. V.
Borisov, V.
Valenti, R.
Ernst, A.
Eremeev, S. V.
Chulkov, E. V.
Pudalov, V. M.
Source :: Physics-Uspekhi, 65(7) 740 (2022)
Publication Year :: 2021
Abstract: 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.<br />Comment: 7 pages, 8 figures, To appear in: Phys.Usp