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 Büchner1,2 — 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 (TN∼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.