Regensburg 2019 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 15: Superconductivity: Fe-based Superconductors - Other Materials and Theory

TT 15.2: Talk

Monday, April 1, 2019, 15:15–15:30, H23

Magnetic order and superconductivity in RbEuFe₄As₄ — •Noah Winterhalter-Stocker¹, Stefan Gorol¹, Stevan Arsenijevic², Yurii Skourski², Hans-Albrecht Krug von Nidda³, Mamoun Hemmida³, Anton Jesche¹, Veronika Fritsch¹, and Philipp Gegenwart¹ — ¹Experimental Physics VI, Center for Electronic Correlations and Magnetism, University of Augsburg, Germany — ²Hochfeld-Magnetlabor Dresden (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — ³Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, Germany

RbEuFe₄As₄ is an ordered member of the class of iron based superconductors with a structure similar to half doped 122 iron based superconductors like Ca_0.5Na_0.5Fe₂As₂. In contrast to the latter RbEuFe₄As₄ 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 paramagnetic Eu 4f moments at T_m=15 K [1]. This leads to a unique interplay between magnetic order and superconductivity which we study by magnetization, magnetotransport and ESR measurements. Our analysis reveals the temperature dependence of the lower and upper critical fields which we compare to appropriate theoretical models.
M. P. Smylie et al., Phys. Rev. B 98, 104503 (2018)