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BaFe2S3 is a special iron superconductor with two-leg ladder structure whichcan help to unravel the role played by the electronic correlations in high-Tcsuperconductivity. At zero pressure it is insulating with stripeantiferromagnetic (AF) order and superconductivity emerges under pressure. Weuse a slave-spin technique to analyze the strength of the local correlations inBaFe2S3. We find that at the pressure at which the superconductivity appearsthe electronic correlations in BaFe2S3 are similar to the ones measured inother iron superconductors. However, at zero pressure the strength of thecorrelations is strongly enhanced, being particularly severe for the twoorbitals with the largest weight at the Fermi level what invalidates nesting asthe mechanism for AF. The system is not a Mott insulator at zero temperature,but these two orbitals with mass enhancements m* ~ 12-15 will become incoherentat higher temperatures. Different from what happens in other ironsuperconductors, at both pressures, the Fermi surface is reconstructed by theelectronic correlations.

Strong electronic correlations and Fermi surface reconstruction in the quasi-one dimensional iron superconductor BaFe2S3