Pressure-induced superconductivity in iron-based spin-ladder compound BaFe2+{\delta}(S1-Sex)3

TL;DR

This paper investigates pressure-induced superconductivity in the iron-based spin-ladder compound BaFe2+{ extdelta}(S1-Sex)3, exploring how magnetic fluctuations and iron stoichiometry influence superconducting properties.

Contribution

It provides new insights into how high pressure and iron concentration affect superconductivity and magnetic phases in BaFe2+d(S1-xSex)3, a less-studied spin-ladder compound.

Findings

Superconductivity emerges under high pressure in BaFe2+d(S1-xSex)3.

Magnetic fluctuations near phase boundaries influence superconducting behavior.

Iron stoichiometry impacts the interplay between magnetism and superconductivity.

Abstract

The iron-based superconductors had a significant impact on condensed matter physics. They have a common structural motif of a two-dimensional square iron lattice and exhibit fruitful physical properties as a strongly correlated electron system. During the extensive investigations, quasi-one-dimensional iron-based spin-ladder compounds attracted much attention as a platform for studying the interplay between magnetic and orbital ordering. In these compounds, BaFe2S3 and BaFe2Se3 were found to exhibit superconductivity under high pressure, having a different crystal and magnetic structure at low temperature. We report a brief review of the iron-based spin-ladder compound and recent studies for BaFe2+d(S1-xSex)3. BaFe2(S0.75 Se0.25)3 is in the vicinity of the boundary of two different magnetic phases and it is intriguing to perform high pressure experiments for studying superconductivity, since effects of large magnetic fluctuations on superconductivity are expected. The effect of iron stoichiometry on the interplay between magnetism and superconductivity is also studied by changing the iron concentration in BaFe2+dSe3.