Singular spin fluctuations in the strange-metal phase of La2-xSrxCuO4
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arXiv
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| Autori principali: | , , , , , , , , , , , , |
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| Natura: | Preprint |
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2026
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| author | Costarella, B. Soriano, L. Vinograd, I. Mayaffre, H. Li, S. Yang, J. Luo, J. Zhou, R. Yao, J. Gu, G. Li, Q. Tranquada, J. M. Julien, M. -H. |
| author_facet | Costarella, B. Soriano, L. Vinograd, I. Mayaffre, H. Li, S. Yang, J. Luo, J. Zhou, R. Yao, J. Gu, G. Li, Q. Tranquada, J. M. Julien, M. -H. |
| contents | Although spin fluctuations are central to the physics of high-Tc cuprates, their relevance to strange-metal behavior in the overdoped regime remains unclear. Here, we use high magnetic fields to suppress superconductivity and an NMR protocol tailored to electronic inhomogeneity to show that the low-energy limit of the dynamical spin susceptibility χ''(q,omega) at x=0.25 in La2-xSrxCuO4 increases continuously down to our lowest temperatures. This behavior is suggestive of quantum-critical fluctuations, a leading candidate mechanism for strange-metal transport, yet is observed well beyond the spin-stripe critical doping x=0.19. Our data further reveal that the spin dynamics are spatially inhomogeneous, suggesting that nanoscale electronic inhomogeneity may underlie this apparent paradox. These observations provide new insight into the electronic state from which strange-metal behavior emerges. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_13573 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Singular spin fluctuations in the strange-metal phase of La2-xSrxCuO4 Costarella, B. Soriano, L. Vinograd, I. Mayaffre, H. Li, S. Yang, J. Luo, J. Zhou, R. Yao, J. Gu, G. Li, Q. Tranquada, J. M. Julien, M. -H. Superconductivity Strongly Correlated Electrons Although spin fluctuations are central to the physics of high-Tc cuprates, their relevance to strange-metal behavior in the overdoped regime remains unclear. Here, we use high magnetic fields to suppress superconductivity and an NMR protocol tailored to electronic inhomogeneity to show that the low-energy limit of the dynamical spin susceptibility χ''(q,omega) at x=0.25 in La2-xSrxCuO4 increases continuously down to our lowest temperatures. This behavior is suggestive of quantum-critical fluctuations, a leading candidate mechanism for strange-metal transport, yet is observed well beyond the spin-stripe critical doping x=0.19. Our data further reveal that the spin dynamics are spatially inhomogeneous, suggesting that nanoscale electronic inhomogeneity may underlie this apparent paradox. These observations provide new insight into the electronic state from which strange-metal behavior emerges. |
| title | Singular spin fluctuations in the strange-metal phase of La2-xSrxCuO4 |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2605.13573 |