Coexistence of superconductivity and magnetic order in BaFe2S3: evidence for orbital-selective delocalization
Abstract
Understanding how superconductivity emerges from correlated electronic states is a central challenge in condensed matter physics. The quasi-one-dimensional spin-ladder compound \bfs\ serves as a unique platform to study this interplay, as it lacks the two-dimensional square lattice characteristic of most iron-based superconductors. Here, we combine high-pressure x-ray and neutron diffraction, x-ray emission spectroscopy, and electrical transport to map its structural, magnetic, and electronic evolution into the superconducting regime. We \revised{observe} a striking pressure-induced decoupling: while the long-range stripe-type antiferromagnetic order remains remarkably robust under pressure up to the onset of superconductivity, the local iron magnetic moment is suppressed by nearly 80\%. This dichotomy \revised{points to an orbital-selective mechanism}, where specific Fe 3d electrons remain localized to sustain magnetism while others delocalize to form the itinerant and superconducting state. \revised{Superconductivity emerges while long-range magnetic order is still present, revealing that the two coexist in \bfs, which we attribute to} the selective response of multiorbital electronic degrees of freedom.
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BibTeX
@misc{oubaid2026coexistence,
title = {{Coexistence of superconductivity and magnetic order in BaFe$_2$S$_3$: evidence for orbital-selective delocalization}},
author = {Y. Oubaid and N. S. Dhami and P. Fertey and C. V. Colin and C. Ritter and A. Forget and D. Bounoua and J. -P. Rueff and M. Verseils and P. Foury-Leylekian and V. Balédent},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.38966},
eprint = {2610.38966},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.38966},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Coexistence of superconductivity and magnetic order in BaFe_2S_3: evidence for orbital-selective delocalization
AU - Y. Oubaid
AU - N. S. Dhami
AU - P. Fertey
AU - C. V. Colin
AU - C. Ritter
AU - A. Forget
AU - D. Bounoua
AU - J. -P. Rueff
AU - M. Verseils
AU - P. Foury-Leylekian
AU - V. Balédent
PY - 2026
DA - 2026/10/28
PB - arXiv
DO - 10.48550/arxiv.2610.38966
UR - https://arxiv.org/abs/2610.38966
AB - Understanding how superconductivity emerges from correlated electronic states is a central challenge in condensed matter physics. The quasi-one-dimensional spin-ladder compound \bfs\ serves as a unique platform to study this interplay, as it lacks the two-dimensional square lattice characteristic of most iron-based superconductors. Here, we combine high-pressure x-ray and neutron diffraction, x-ray emission spectroscopy, and electrical transport to map its structural, magnetic, and electronic evolution into the superconducting regime. We \revised{observe} a striking pressure-induced decoupling: while the long-range stripe-type antiferromagnetic order remains remarkably robust under pressure up to the onset of superconductivity, the local iron magnetic moment is suppressed by nearly 80\%. This dichotomy \revised{points to an orbital-selective mechanism}, where specific Fe 3d electrons remain localized to sustain magnetism while others delocalize to form the itinerant and superconducting state. \revised{Superconductivity emerges while long-range magnetic order is still present, revealing that the two coexist in \bfs, which we attribute to} the selective response of multiorbital electronic degrees of freedom.
ER -