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TT: Fachverband Tiefe Temperaturen

TT 16: Poster Session Superconductivity, Cryogenic Particle Detectors, Cryotechnique

TT 16.11: Poster

Montag, 16. März 2020, 15:00–19:00, P2/EG

Superconductivity and quasi two dimensional magnetism in EuRbFe₄As₄ — •Noah Winterhalter-Stocker¹, Stefan Gorol¹, Stevan Arsenijevic², Yurii Skourski², Hans-Albrecht Krug von Nidda³, Mamoun Hemmida³, Dieter Ehlers³, Anton Jesche¹, Veronika Fritsch¹, and Philipp Gegenwart¹ — ¹EP VI, Center for Electronic Correlations and Magnetism, University of Augsburg, Germany — ²Hochfeld-Magnetlabor Dresden (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — ³EP V, Center for Electronic Correlations and Magnetism, University of Augsburg, Germany

EuRbFe₄As₄ is a member of the new 1144 structure type of IBSCs, which contains parmagnetic Eu 4f moments. This structure is highly related to half doped 122 IBSCs. In contrast to the latter EuRbFe₄As₄ shows a superstructure with distinct Eu and Rb positions. The material shows a superconducting transition at T_c = 36.8 K and an onset of magnetic order of the Eu moments at T_m = 15 K [1]. We study the magnetic order and superconductivity by magnetization, magnetotransport and ESR measurements. Our analysis reveals the temperature dependence of the lower and upper critical fields. The ESR-measurements along with the magnetization data indicate the quasi two dimensional nature of the Eu magnetism. This becomes manifest in a Berezinsky-Kosterlitz-Thouless transition of the Eu, which was proposed by [2] and is confirmed by the ESR data.
[1] M. P. Smylie et al., Phys. Rev. B 98, 104503 (2018)
[2] K. Willa et al., Phys. Rev. B 99, 180502 (2019)