Persistent paramagnons in high-temperature infinite-layer nickelate superconductors
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arXiv
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| Autores principales: | , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| author | Yan, Yujie Chan, Ying Hong, Xunyang Chow, S. Lin Er Luo, Zhaoyang Li, Yuehong Wang, Tianren Wu, Yuetong Biało, Izabela Fitriyah, Nurul Prakash, Saurav Gao, Xing Yip, King Yau Gao, Qiang Ren, Xiaolin Choi, Jaewon Channagowdra, Ganesha Okamoto, Jun Zhou, Xingjiang Zhu, Zhihai Si, Liang Garcia-Fernandez, Mirian Zhou, Ke-Jin Huang, Hsiao-Yu Huang, Di-Jing Chang, Johan Ariando, A. Wang, Qisi |
| author_facet | Yan, Yujie Chan, Ying Hong, Xunyang Chow, S. Lin Er Luo, Zhaoyang Li, Yuehong Wang, Tianren Wu, Yuetong Biało, Izabela Fitriyah, Nurul Prakash, Saurav Gao, Xing Yip, King Yau Gao, Qiang Ren, Xiaolin Choi, Jaewon Channagowdra, Ganesha Okamoto, Jun Zhou, Xingjiang Zhu, Zhihai Si, Liang Garcia-Fernandez, Mirian Zhou, Ke-Jin Huang, Hsiao-Yu Huang, Di-Jing Chang, Johan Ariando, A. Wang, Qisi |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_18373 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Persistent paramagnons in high-temperature infinite-layer nickelate superconductors Yan, Yujie Chan, Ying Hong, Xunyang Chow, S. Lin Er Luo, Zhaoyang Li, Yuehong Wang, Tianren Wu, Yuetong Biało, Izabela Fitriyah, Nurul Prakash, Saurav Gao, Xing Yip, King Yau Gao, Qiang Ren, Xiaolin Choi, Jaewon Channagowdra, Ganesha Okamoto, Jun Zhou, Xingjiang Zhu, Zhihai Si, Liang Garcia-Fernandez, Mirian Zhou, Ke-Jin Huang, Hsiao-Yu Huang, Di-Jing Chang, Johan Ariando, A. Wang, Qisi Superconductivity Strongly Correlated Electrons 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. |
| title | Persistent paramagnons in high-temperature infinite-layer nickelate superconductors |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2507.18373 |