Gradual Enhancement of Stripe-Type Antiferromagnetism in Spin Ladder Material BaFe$_2$S$_3$ Under Pressure
Open Access Publications from the University of California

## Gradual Enhancement of Stripe-Type Antiferromagnetism in Spin Ladder Material BaFe$_2$S$_3$ Under Pressure

• Author(s): Zheng, L
• Frandsen, BA
• Wu, C
• Yi, M
• Wu, S
• Huang, Q
• Bourret-Courchesne, E
• Simutis, G
• Khasanov, R
• Yao, D-X
• Wang, M
• Birgeneau, RJ
• et al.
Abstract

The recent discovery of pressure-induced superconductivity in BaFe$_2$S$_3$ and BaFe$_2$Se$_3$ has generated considerable interest in the 123-type iron chalcogenides. The structure of these materials features iron atoms arranged in quasi-one-dimensional ladders with either stripe-type or block-type antiferromagnetism at ambient pressure, constituting a new parent state for iron-based superconductivity in need of detailed study. Here, we report pressure-dependent neutron diffraction and muon spin relaxation/rotation measurements combined with first-principles calculations to investigate the structural, magnetic, and electronic properties of BaFe$_2$S$_3$ under pressure. The experimental results reveal a gradual enhancement of the stripe-type ordering temperature with increasing pressure up to 2.6 GPa and no observable change in the size of the ordered moment. The \textit{ab initio} calculations suggest that the magnetism is highly sensitive to the Fe-S bond lengths and angles, clarifying discrepancies with previously published results. In contrast to our experimental observations, the calculations predict a reduction of the ordered moment with pressure. We suggest that the robustness of the stripe-type antiferromagnetism is due to strong electron correlations not fully considered in the calculations.

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