Berlin 2018 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 47: Poster Session II

MM 47.38: Poster

Mittwoch, 14. März 2018, 18:30–19:45, Poster C

Reducing the dimensionality in iron-based superconductors: quasi-one dimensional iron chalcogenide BaFe₂S₃ — •María Lourdes Amigó¹, Malin Lüdicke¹, Anja Wolter-Giraud¹, Christian Hess¹, Saicharan Aswartham¹, Silvia Seiro¹, and Bernd Büchner^1,2 — ¹IFW-Dresden, Germany — ²TU-Dresden, Germany

The layered crystalline structure is a characteristic shared by most iron-based superconductors. A very interesting question is how the superconductivity evolves if the dimensionality is further reduced. Iron-chalcogen-based structures are extremely flexible and allow the exploration of dimensionality effects on the physical properties since iron atoms can form low-dimensional structures including chains (e.g. BaFe₂S₄) or ladders (BaFe₂S₃). BaFe₂S₃ and BaFe₂Se₃ are antiferromagnetic Mott insulators and have been reported to become metallic under pressure. The metallic phase presents superconductivity at low temperatures.

In this work, we focus on the synthesis of single crystals of BaFe₂S₃. We present a comprehensive characterization together with the resistivity and the magnetization. Above the Néel temperature (T_N∼120K), the magnetization decreases upon cooling. This non-Curie-Weiss behavior is similar to what is found in the parent compounds of the iron-based superconductors. The resistivity presents an insulating-like behavior with a first kink at T∼200K and a second at the Néel temperature.