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arxiv: 2507.18373 · v1 · pith:EQKVDSJ2new · submitted 2025-07-24 · ❄️ cond-mat.supr-con · cond-mat.str-el

Persistent paramagnons in high-temperature infinite-layer nickelate superconductors

Yujie Yan , Ying Chan , Xunyang Hong , S. Lin Er Chow , Zhaoyang Luo , Yuehong Li , Tianren Wang , Yuetong Wu
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Izabela Bia{\l}o Nurul Fitriyah Saurav Prakash Xing Gao King Yau Yip Qiang Gao Xiaolin Ren Jaewon Choi Ganesha Channagowdra Jun Okamoto Xingjiang Zhou Zhihai Zhu Liang Si Mirian Garcia-Fernandez Ke-Jin Zhou Hsiao-Yu Huang Di-Jing Huang Johan Chang A. Ariando Qisi Wang
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classification ❄️ cond-mat.supr-con cond-mat.str-el
keywords superconductivityhigh-temperaturehole-dopedinfinite-layerinteractionsmagneticnickelatenickelates
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The recent discovery of high-temperature superconductivity in hole-doped SmNiO$_2$, exhibiting the record-high transition temperature $T_c$ among infinite-layer (IL) nickelates, has opened a new avenue for exploring design principles of superconductivity. 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 $L$-edge resonant inelastic x-ray scattering (RIXS) study of superconducting Sm-based IL nickelate thin films Sm$_{1-x-y-z}$Eu$_x$Ca$_y$Sr$_z$NiO$_2$ (SECS). Dispersive paramagnonic excitations are observed in both optimally and overdoped SECS samples, supporting a spin-fluctuation-mediated pairing scenario. However, despite the two-fold enhancement of $T_c$ 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 $T_c$, highlighting essential differences in their superconducting mechanisms.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

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    cond-mat.str-el 2026-05 unverdicted novelty 6.0

    Superconductivity in bilayer nickelates occurs in SDW-free oxygen-stoichiometric regions, with an interlayer five-spin polaron proposed as the ground state.

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    cond-mat.supr-con 2025-11 unverdicted novelty 6.0

    RIXS reveals smaller in-plane magnetic exchange in PrNiO2 than in CaCuO2 with similar out-of-plane values, plus distinct Ni-dxy orbital dispersion interpreted as orbital superexchange-driven orbiton propagation.

  4. Interlayer Five-Spin Polaron in Superconducting Bilayer Nickelates

    cond-mat.str-el 2026-05 unverdicted novelty 5.0

    Resonant x-ray scattering on La2PrNi2O7 films reveals superconductivity in SDW-free oxygen-stoichiometric regions with distinct c-axis electronic structure, proposing an interlayer five-spin polaron ground state.