77Se-NMR shows the anomalous low-temperature relaxation upturn in FeSe0.82S0.18 is suppressed but persists under pressure up to 2 GPa, consistent with Bogoliubov Fermi surface quasiparticle interactions.
Ferromagnetic inter-layer coupling in FeSe$_{1-x}$S$_{x}$ superconductors revealed by inelastic neutron scattering
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abstract
FeSe$_{1-x}$S$_{x}$ superconductors are commonly considered layered van der Waals materials with negligible inter-layer coupling. Here, using inelastic neutron scattering to study spin excitations in single-crystal samples, we reveal that the magnetic coupling between adjacent Fe layers is not only significant, as it affects excitations up to \textcolor{black}{15} meV, but also ferromagnetic in nature, making the system different from most unconventional superconductors including iron pnictides. Our observation provides a new standpoint to understand the absence of magnetic order in FeSe$_{1-x}$S$_{x}$. Since intercalating between the Fe layers is known to enhance superconductivity and suppress the inter-layer coupling, superconductivity appears to be a more robust phenomenon in the two-dimensional limit than antiferromagnetic order.
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Quasiparticle interaction originating from Bogoliubov Fermi Surfaces under pressure in 18%-S substituted FeSe studied via NMR
77Se-NMR shows the anomalous low-temperature relaxation upturn in FeSe0.82S0.18 is suppressed but persists under pressure up to 2 GPa, consistent with Bogoliubov Fermi surface quasiparticle interactions.