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, C. Felser, B. Büchner, J. Fink, S. Gorol, T. Förster, S. Arsenijevic, V. Fritsch, P. Gegenwart
DOI 10.1103/PhysRevB.103.195112 · Physical Review B
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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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| EuRbFe4As4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 36.5 | Pressure not reported | onset |
| EuRbFe4As4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 36.5 | Pressure not reported | onset |
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