M. Hemmida, N. Winterhalter-Stocker, D. Ehlers, H.-A. Krug von Nidda, M. Yao, J. Bannies, E. Rienks, R. Kurleto, C. Felser, B. Büchner, J. Fink, S. Gorol, T. Förster, S. Arsenijevic, V. Fritsch, P. Gegenwart
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Topological magnetic order and superconductivity in
EuRbFe4As4
We study single crystals of the magnetic superconductor EuRbFe$_4$As$_4$ by magnetization, electron spin resonance (ESR), angle-resolved photoemission spectroscopy (ARPES) and electrical resistance in pulsed magnetic fields up to 630 kOe. The superconducting state below 36.5 K is almost isotropic and only weakly affected by the development of Eu$^{2+}$ 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 Eu$^{2+}$-planes are a good realization of a two-dimensional XY-magnet, which reflects the decoupling of the Eu$^{2+}$ magnetic moments from superconducting FeAs-layers.
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