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26 April 2024

» arxiv » 2010.02110

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Topological magnetic order and superconductivity in EuRbFe$_4$As$_4$
M. Hemmida ; N. Winterhalter-Stocker ; D. Ehlers ; H.-A. Krug von Nidda ; M. Yao ; J. Bannies ; E.D.L. Rienks ; R. Kurleto ; C. Felser ; B. Büchner ; J. Fink ; S. Gorol ; T. Förster ; S. Arsenijevic ; V. Fritsch ; P. Gegenwart ;
Date:	5 Oct 2020
Abstract:	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.
Source:	arXiv, 2010.02110
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