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We report pressure-dependent neutron diffraction and muon spinrelaxation/rotation measurements combined with first-principles calculations toinvestigate the structural, magnetic, and electronic properties ofBaFe$_2$S$_3$ under pressure. The experimental results reveal a gradualenhancement of the stripe-type ordering temperature with increasing pressure upto 2.6 GPa and no observable change in the size of the ordered moment. The abinitio calculations suggest that the magnetism is highly sensitive to the Fe-Sbond lengths and angles, clarifying discrepancies with previously publishedresults. In contrast to our experimental observations, the calculations predicta monotonic reduction of the ordered moment with pressure. We suggest that therobustness of the stripe-type antiferromagnetism is due to strong electroncorrelations not fully considered in the calculations.

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