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Experimentally determining the electronic structure and magnetic interactions in this new system is crucial to elucidating the mechanism behind the enhanced superconductivity. Here, we report a Ni\n                    <jats:italic>L<\/jats:italic>\n                    -edge resonant inelastic x-ray scattering (RIXS) study of superconducting Sm-based IL nickelate thin films Sm\n                    <jats:sub>\n                      1\u2212\n                      <jats:italic>x<\/jats:italic>\n                      \u2212\n                      <jats:italic>y<\/jats:italic>\n                    <\/jats:sub>\n                    Eu\n                    <jats:sub>\n                      <jats:italic>x<\/jats:italic>\n                    <\/jats:sub>\n                    Ca\n                    <jats:sub>\n                      <jats:italic>y<\/jats:italic>\n                    <\/jats:sub>\n                    NiO\n                    <jats:sub>2<\/jats:sub>\n                    (SECNO). Dispersive paramagnonic excitations are observed in both optimally and overdoped SECNO samples, supporting a spin-fluctuation-mediated pairing scenario. However, despite the two-fold enhancement of\n                    <jats:italic>T<\/jats:italic>\n                    <jats:sub>\n                      <jats:italic>c<\/jats:italic>\n                    <\/jats:sub>\n                    in the Sm-based nickelates compared to their Pr-based counterparts, the effective exchange coupling strength is reduced by approximately 20%. This behavior contrasts with hole-doped cuprates, where magnetic interactions correlate positively with\n                    <jats:italic>T<\/jats:italic>\n                    <jats:sub>\n                      <jats:italic>c<\/jats:italic>\n                    <\/jats:sub>\n                    , highlighting essential differences in their superconducting mechanisms.\n                  <\/jats:p>","DOI":"10.1038\/s41467-026-73083-3","type":"journal-article","created":{"date-parts":[[2026,5,20]],"date-time":"2026-05-20T11:59:26Z","timestamp":1779278366000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Persistent paramagnons in high-temperature infinite-layer nickelate superconductors"],"prefix":"10.1038","volume":"17","author":[{"ORCID":"https:\/\/orcid.org\/0009-0005-0686-367X","authenticated-orcid":false,"given":"Yujie","family":"Yan","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ying","family":"Chan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xunyang","family":"Hong","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"S. 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