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Topological magnetic order and superconductivity in EuRbFe4As4

Authors :
Hemmida, M.
Winterhalter-Stocker, N.
Ehlers, D.
Krug Von Nidda, H.-A.
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.
Source :
Physical Review B 103(2021), 195112
Publication Year :
2021

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.

Details

Language :
English
Database :
OpenAIRE
Journal :
Physical Review B 103(2021), 195112
Accession number :
edsair.od......4577..1339f172df170843410da55cb69ef6d0