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Topological magnetic order and superconductivity in EuRbFe4As4

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Bannies,  J.
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Felser,  C.
Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Fink,  J.
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Hemmida, M., Winterhalter-Stocker, N., Ehlers, D., Von Nidda, H.-A., Yao, M., Bannies, J., et al. (2021). Topological magnetic order and superconductivity in EuRbFe4As4. Physical Review B, 103(19): 195112, pp. 1-13. doi:10.1103/PhysRevB.103.195112.


Cite as: http://hdl.handle.net/21.11116/0000-0008-A0A4-9
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. © 2021 American Physical Society.