LAUSR

High pressure resistance, susceptibility, and Fe $K\ensuremath{\beta}$ x-ray emission spectroscopy measurements were performed on Fe-ladder compound ${\mathrm{BaFe}}_{2}{\mathrm{Se}}_{3}$. Pressure-induced superconductivity was observed which is similar to the previously reported superconductivity in the ${\mathrm{BaFe}}_{2}{\mathrm{S}}_{3}$ samples. The slope of local magnetic moment versus pressure shows an anomaly across the insulator-metal transition pressure in the ${\mathrm{BaFe}}_{2}{\mathrm{Se}}_{3}$ samples. The local magnetic moment is continuously decreasing with increasing pressure, and the superconductivity appears only when the local magnetic moment value is comparable to the one in the iron-pnictide superconductors. Our results indicate that the compressed ${\mathrm{BaFe}}_{2}C{h}_{3}$ ($Ch=\mathrm{S}$, Se) is a new family of iron-based superconductors. Despite the crystal structures completely different from the known iron-based superconducting materials, the magnetism in this Fe-ladder material plays a critical role in superconductivity. This behavior is similar to the other members of iron-based superconducting materials.