Impact of Electron Correlations on Infinite-Layer Cuprates and Nickelates
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arXiv
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| Autores principales: | , , , , , , , , , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| Acceso en línea: | |
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| author | Hong, Xunyang Wu, Yuetong Chan, Ying Li, Sze Tung Biało, I. Martinelli, L. Drewanowski, A. Gao, Qiang Ren, Xiaolin Zhou, Xingjiang Zhu, Zhihai Galdi, A. Schlom, D. G. Shen, K. M. Choi, J. Fernandez, M. Garcia Zhou, Ke-Jin Brookes, N. B. Rønnow, H. M. Wang, Qisi Chang, J. |
| author_facet | Hong, Xunyang Wu, Yuetong Chan, Ying Li, Sze Tung Biało, I. Martinelli, L. Drewanowski, A. Gao, Qiang Ren, Xiaolin Zhou, Xingjiang Zhu, Zhihai Galdi, A. Schlom, D. G. Shen, K. M. Choi, J. Fernandez, M. Garcia Zhou, Ke-Jin Brookes, N. B. Rønnow, H. M. Wang, Qisi Chang, J. |
| contents | Optimization of unconventional superconductivity involves a balance of interaction strengths. Precise determination of correlation strength across different material families is therefore important. Here, we present a combined X-ray absorption spectroscopy (XAS) and resonant inelastic X-ray scattering (RIXS) study of infinite-layer PrNiO$_2$ and SrCuO$_2$ that enables fair comparison of their interaction strengths. For both compounds, we study the orbital and magnetic excitations and extract their dispersions along high-symmetry directions. Using a single-band Hubbard model and including higher-order exchange interactions, we derive the correlation factor $U/t$ for both compounds. A key finding is that despite a smaller Coulomb repulsion $U$, PrNiO$_2$ exhibits a correlation strength that is 20% stronger than that of its isostructural cuprate counterpart SrCuO$_2$. This indicates that a moderation of the correlation strength may further optimize superconductivity in nickelates. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_09460 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Impact of Electron Correlations on Infinite-Layer Cuprates and Nickelates Hong, Xunyang Wu, Yuetong Chan, Ying Li, Sze Tung Biało, I. Martinelli, L. Drewanowski, A. Gao, Qiang Ren, Xiaolin Zhou, Xingjiang Zhu, Zhihai Galdi, A. Schlom, D. G. Shen, K. M. Choi, J. Fernandez, M. Garcia Zhou, Ke-Jin Brookes, N. B. Rønnow, H. M. Wang, Qisi Chang, J. Superconductivity Strongly Correlated Electrons Optimization of unconventional superconductivity involves a balance of interaction strengths. Precise determination of correlation strength across different material families is therefore important. Here, we present a combined X-ray absorption spectroscopy (XAS) and resonant inelastic X-ray scattering (RIXS) study of infinite-layer PrNiO$_2$ and SrCuO$_2$ that enables fair comparison of their interaction strengths. For both compounds, we study the orbital and magnetic excitations and extract their dispersions along high-symmetry directions. Using a single-band Hubbard model and including higher-order exchange interactions, we derive the correlation factor $U/t$ for both compounds. A key finding is that despite a smaller Coulomb repulsion $U$, PrNiO$_2$ exhibits a correlation strength that is 20% stronger than that of its isostructural cuprate counterpart SrCuO$_2$. This indicates that a moderation of the correlation strength may further optimize superconductivity in nickelates. |
| title | Impact of Electron Correlations on Infinite-Layer Cuprates and Nickelates |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2511.09460 |