• Hemmida, M.; Winterhalter-Stocker, N.; Ehlers, D.; Von Nidda, H.A.K.; Yao, M.; Bannies, J.; Rienks, E.D.L.; Kurleto, R.; Felser, C.; Büchner, B.; Fink, J.; Gorol, S.; Förster, T.; Arsenijevic, S.; Fritsch, V.; Gegenwart, P.: Topological magnetic order and superconductivity in EuRbFe4As4. Physical Review B 103 (2021), p. 195112/1-13

10.1103/physrevb.103.195112
Open Access Version

Abstract:
We study single crystals of the magnetic superconductor EuRbFe4As4 by magnetization, electron spin resonance (ESR), angle-resolved photoemission spectroscopy, and electrical resistance in pulsed magnetic fields up to 63 T. The superconducting state below 36.5 K is almost isotropic and is only weakly affected by the development of Eu2+ magnetic order at 15 K. On the other hand, for the external magnetic field applied along the c axis the temperature dependence of the ESR linewidth reveals a Berezinskii-Kosterlitz-Thouless topological transition below 15 K. This indicates that Eu2+ planes are a good realization of a two-dimensional XY magnet, which reflects the decoupling of the Eu2+ magnetic moments from superconducting FeAs layers.