The magnetic precursor of the pressure-induced superconductivity in Fe-ladder compound
arXiv:1606.09223 · doi:10.1103/PhysRevLett.117.047003
Abstract
The pressure effects on the antiferromagentic orders in iron-based ladder compounds CsFeSe and BaFeS 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 CsFeSe 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 BaFeS, undergoes a quantum phase transition where an abrupt increase of Nel temperature by more than 50 occurs at about 1 GPa, accompanied by a jump in the ordered moment. With its spin structure unchanged, BaFeS 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.
arXiv comment5 pages, 4 figures, 1 table Accepted for publication on Physical Review Letters
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