Reducing the dimensionality in iron-based superconductors: quasi-one dimensional iron chalcogenide BaFe2S3

AMIGÓ, M. L.; MALIN LÜDICKE; ANJA WOLTER-GIRAUD; CHRISTIAN HESS; SAICHARAN ASWARTHAM; SILVIA SEIRO; BERND BÜCHNER

Berlin

Conferencia; DPG Spring Meeting 2018; 2018

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 lowtemperatures. In this work, we focus on the synthesis of single crystals of BaFe2S3. We present a comprehensive characterization togetherwith 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.