Topological magnetic order and superconductivity in EuRbFe$_4$As$_4

Phys. Rev. B 103, 195112 (2021) 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 bel...

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Bibliographic Details
Main Authors:	Hemmida, M, Winterhalter-Stocker, N, Ehlers, D, von Nidda, H. -A. Krug, 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
Format:	Journal Article
Language:	English
Published:	05-10-2020
Subjects:	Physics - Strongly Correlated Electrons Physics - Superconductivity
Online Access:	Get full text
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Summary:	Phys. Rev. B 103, 195112 (2021) 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.
DOI:	10.48550/arxiv.2010.02110