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Novel magnetic stoichiometric superconductor EuRbFe4As4

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arxiv 2108.13928 v1 pith:B7ECMWHU submitted 2021-08-31 cond-mat.supr-con cond-mat.str-el

T.K. Kim , K.S. Pervakov , V.A. Vlasenko , A.V. Sadakov , A.S. Usoltsev , D.V. Evtushinsky , S.W. Jung , G. Poelchen
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K. Kummer D. Roditchev V.S. Stolyarov I.A. Golovchanskiy D.V. Vyalikh V. Borisov R. Valenti A. Ernst S.V. Eremeev E.V. Chulkov V.M. Pudalov
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classification cond-mat.supr-concond-mat.str-el
keywords spectroscopymagneticnovelphotoemissionstatesstoichiometricaddressedalmost
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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.

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