Persistent paramagnons in high-temperature infinite-layer nickelate superconductors
Qisi Wang
Nature Communications, Published online: 20 May 2026; doi:10.1038/s41467-026-73083-3 The authors report a resonant inelastic x-ray scattering study of superconducting Sm-based infinite-layer nickelate thin films. Despite the two-fold enhancement of Tc in the Sm-based nickelates compared to their Pr-based counterparts, they find that the effective in-plane exchange coupling strength is reduced by approximately 20%.