Coexistence of Antiferromagnetic Spin Fluctuations and Superconductivity in La2SmNi2O7 Thin Films
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866908820400242688 |
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| author | Xu, Minhui Wang, Yibo Liu, Jia Cheng, Long Li, Shuyin Yin, Shuaishuai Zheng, Xu Yu, Lixin Zhao, Aidi Li, Xiaolong Zhang, Jiandi Zhai, Xiaofang |
| author_facet | Xu, Minhui Wang, Yibo Liu, Jia Cheng, Long Li, Shuyin Yin, Shuaishuai Zheng, Xu Yu, Lixin Zhao, Aidi Li, Xiaolong Zhang, Jiandi Zhai, Xiaofang |
| contents | The interplay between magnetic fluctuations and superconductivity is fundamental for understanding unconventional high-temperature superconductors. In the recently discovered Ruddlesden-Popper phase nickelates-which achieve superconducting transition temperatures up to ~100 K-this connection has been theoretically predicted but experimentally unverified. Using compressively strained La2SmNi2O7 thin films, we report direct evidence for this interplay. We observe a characteristic 'Mexican hat'-shaped magnetoresistance, a signature of superconductivity coexisting with emergent antiferromagnetic (AFM) fluctuations. This distinctive feature arises from a competition between the magnetic field's suppression of AFM fluctuation-driven scattering and its suppression of superconducting fluctuations. We quantify these AFM fluctuations by a crossover field, B*, whose magnitude decreases with increasing temperature and vanishes near the superconducting onset-behavior contrasting sharply with that in high-Tc cuprates. Our results establish not merely coexistence, but also a direct and novel correlation between AFM instability and superconductivity in nickelates, offering crucial insight into their pairing mechanism. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_07994 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Coexistence of Antiferromagnetic Spin Fluctuations and Superconductivity in La2SmNi2O7 Thin Films Xu, Minhui Wang, Yibo Liu, Jia Cheng, Long Li, Shuyin Yin, Shuaishuai Zheng, Xu Yu, Lixin Zhao, Aidi Li, Xiaolong Zhang, Jiandi Zhai, Xiaofang Superconductivity Strongly Correlated Electrons The interplay between magnetic fluctuations and superconductivity is fundamental for understanding unconventional high-temperature superconductors. In the recently discovered Ruddlesden-Popper phase nickelates-which achieve superconducting transition temperatures up to ~100 K-this connection has been theoretically predicted but experimentally unverified. Using compressively strained La2SmNi2O7 thin films, we report direct evidence for this interplay. We observe a characteristic 'Mexican hat'-shaped magnetoresistance, a signature of superconductivity coexisting with emergent antiferromagnetic (AFM) fluctuations. This distinctive feature arises from a competition between the magnetic field's suppression of AFM fluctuation-driven scattering and its suppression of superconducting fluctuations. We quantify these AFM fluctuations by a crossover field, B*, whose magnitude decreases with increasing temperature and vanishes near the superconducting onset-behavior contrasting sharply with that in high-Tc cuprates. Our results establish not merely coexistence, but also a direct and novel correlation between AFM instability and superconductivity in nickelates, offering crucial insight into their pairing mechanism. |
| title | Coexistence of Antiferromagnetic Spin Fluctuations and Superconductivity in La2SmNi2O7 Thin Films |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2602.07994 |