The pressure effects on the antiferromagentic orders in iron-based ladder compounds BaFe$_2$S$_3$

The ladder compounds have recently become a new test ground for the studies on Fe-based superconductors. The building block for such materials, the two-leg Fe ladder surrounded by edge-sharing chalcogen tetrahedra, has provided a quasi-one-dimensional channel for the remaining critical issues in this field. Recently, superconductivity was successfully induced by pressure in one of such compounds, BaFe$_2$S$_3$. The knowledge of the pressure effect on its antiferromagnetic order is crucial in understanding the superconductivity in the low-dimensional system. I will present the results of our neutron diffraction studies on the evolution of the magnetic phase under hydraulic pressure in single crystalline BaFe$_2$S$_3$.