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<p>The recent discovery of high-temperature superconductivity in hole-doped SmNiO<sub>2</sub>, exhibiting the record-high transition temperature <i>T</i><sub><i>c</i></sub> 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 <i>L</i>-edge resonant inelastic x-ray scattering (RIXS) study of superconducting Sm-based IL nickelate thin films Sm<sub>1−<i>x</i>−<i>y</i></sub>Eu<sub><i>x</i></sub>Ca<sub><i>y</i></sub>NiO<sub>2</sub> (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 <i>T</i><sub><i>c</i></sub> 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 <i>T</i><sub><i>c</i></sub>, highlighting essential differences in their superconducting mechanisms.</p>

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Persistent paramagnons in high-temperature infinite-layer nickelate superconductors

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月20日

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  • Yujie Yan,
  • Ying Chan,
  • Xunyang Hong,
  • S. Lin Er Chow,
  • Zhaoyang Luo,
  • Yuehong Li,
  • Tianren Wang,
  • Yuetong Wu,
  • Izabela Biało,
  • 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

摘要

The recent discovery of high-temperature superconductivity in hole-doped SmNiO2, exhibiting the record-high transition temperature Tc 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 Sm1−x−yEuxCayNiO2 (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 Tc 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 Tc, highlighting essential differences in their superconducting mechanisms.