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Topological magnetic order and superconductivity in EuRbFe₄As₄

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arxiv 2010.02110 v1 pith:SW7QACGN submitted 2020-10-05 cond-mat.supr-con cond-mat.str-el

Topological magnetic order and superconductivity in EuRbFe₄As₄

M. Hemmida , N. Winterhalter-Stocker , D. Ehlers , H.-A. Krug von Nidda , M. Yao , J. Bannies , E.D.L. Rienks , R. Kurleto
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C. Felser B. B\"uchner J. Fink S. Gorol T. F\"orster S. Arsenijevic V. Fritsch P. Gegenwart
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classification cond-mat.supr-con cond-mat.str-el
keywords magneticbeloweurbfeordersuperconductingtopologicalaffectedalmost
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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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