Strong ferromagnetic exchange interaction in the parent state of the superconductivity in BaFe${}_2$S${}_3$

Abstract

Inelastic neutron scattering measurements have been performed to investigate the spin waves of the quasi-one-dimensional antiferromagnetic ladder compound BaFe${}_2$S${}_3$, where a superconducting transition was observed under pressure [H. Takahashi {\it et al.}, Nat. Mater. 14, 1008-1012 (2015); T. Yamauchi {\it et al.}, Phys. Rev. Lett. 115, 246402 (2015)]. By fitting the spherically averaged experimental data collected on a powder sample to a Heisenberg Hamiltonian, we find that the one-dimensional antiferromagnetic ladder exhibits a strong nearest neighbor ferromagnetic exchange interaction ($S{J}_R=-71\pm 4$ meV) along the rung direction, an antiferromagnetic $S{J}_L=49\pm 3$ meV along the leg direction and a ferromagnetic $S{J}_2=-15\pm 2$ meV along the diagonal direction. Our data demonstrate that the antiferromagnetic spin excitations are a common characteristic for the iron-based superconductors, while specific relative values for the exchange interactions do not appear to be unique for the parent states of the superconducting materials.

3 figures, supplementary files can be supplied by request

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• Sequential structural and antiferromagnetic transitions in BaFe${}_2$Se${}_3$ under pressure
• Block orbital-selective Mott insulators: a spin excitation analysis
• Quantum magnetism of iron-based ladders: Blocks, spirals, and spin flux
• Structural, magnetic, and electronic evolution of the spin-ladder system BaFe${}_2$S${}_{3-x}$Se${}_x$ with isoelectronic substitution
• Purely antiferromagnetic frustrated Heisenberg model in spin ladder compound BaFe${}_2$Se${}_3$
• Quasi-one-dimensional spin excitations in the iron pnictide NaFe${}_{0.53}$Cu${}_{0.47}$As