Novel magnetic stoichiometric superconductor EuRbFe4As4
T.K. Kim, K.S. Pervakov, V.A. Vlasenko, A.V. Sadakov, A.S. Usoltsev,, D.V. Evtushinsky, S.W. Jung, G. Poelchen, 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, and V.M. Pudalov
TL;DR
This paper investigates the coexistence of superconductivity and magnetic order in the novel EuRbFe4As4 compound, revealing that Fe- and Eu-derived states are largely decoupled, allowing independent superconducting and magnetic phases.
Contribution
It provides experimental evidence that superconductivity and magnetic order coexist independently in EuRbFe4As4, challenging previous assumptions about their interaction in such materials.
Findings
Fe- and Eu-derived states are largely decoupled.
Superconductivity and magnetic order coexist independently.
Multiple spectroscopic techniques confirm the decoupling.
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.
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