The magnetic precursor of the pressure-induced superconductivity in Fe-ladder compound

Abstract

The pressure effects on the antiferromagentic orders in iron-based ladder compounds CsFe${}_2$Se${}_3$ and BaFe${}_2$S${}_3$ have been studied using neutron diffraction. With identical crystal structure and similar magnetic structures, the two compounds exhibit highly contrasting magnetic behaviors under moderate external pressures. In CsFe${}_2$Se${}_3$ the ladders are brought much closer to each other by pressure, but the stripe-type magnetic order shows no observable change. In contrast, the stripe order in BaFe${}_2$S${}_3$, undergoes a quantum phase transition where an abrupt increase of N$\acute{e}$el temperature by more than 50$\%$ occurs at about 1 GPa, accompanied by a jump in the ordered moment. With its spin structure unchanged, BaFe${}_2$S${}_3$ enters an enhanced magnetic phase that bears the characteristics of an orbital selective Mott phase, which is the true neighbor of superconductivity emerging at higher pressures.

5 pages, 4 figures, 1 table Accepted for publication on Physical Review Letters

References in corpus (7)

• Magnetism and its microscopic origin in iron-based high-temperature superconductors
• Spin freezing transition and non-Fermi-liquid self-energy in a 3-orbital model
• Orbital-Selective Mott transition out of band degeneracy lifting
• High-spin to low-spin and orbital polarization transitions in multiorbital Mott systems
• Hund's coupling key role in multi-orbital correlations
• Magnetic States of the Two-Leg Ladder Alkali Metal Iron Selenides $A$Fe${}_2$Se${}_3$
• Coexistence of localized and itinerant electrons in BaFe2X3 (X = S and Se) revealed by photoemission spectroscopy

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• PhD Thesis: Electronic correlations in multiorbital systems