Evolution of the Superfluid Density in Infinite-Layer Nickelates
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866911537326718976 |
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| author | Wang, Bai Yang Harvey, Shannon P. Lee, Kyuho Yu, Yijun Lee, Yonghun Osada, Motoki Murthy, Chaitanya Raghu, Srinivas Hwang, Harold Y. |
| author_facet | Wang, Bai Yang Harvey, Shannon P. Lee, Kyuho Yu, Yijun Lee, Yonghun Osada, Motoki Murthy, Chaitanya Raghu, Srinivas Hwang, Harold Y. |
| contents | Nickelate superconductors provide a valuable new platform for the study of unconventional superconductivity that is complementary to the cuprates. One of the central puzzles about high-temperature superconductors is what factors determine the scale of their superconducting transition temperature ($T_\mathrm{c}$). To address this question for infinite-layer nickelates, we present a systematic mutual inductance study of the superfluid density across the doping-dependent superconducting dome of $\mathrm{Nd}_{1-x}\mathrm{Sr}_x\mathrm{NiO}_2$. We observe a weak superfluid stiffness that exhibits an approximately square-root correlation with $T_\mathrm{c}$. We also find a strong interplay between Nd magnetism and the superconducting phase, manifested as a substantial low-temperature suppression of superfluid density. These observations highlight the importance of superconducting phase fluctuations in limiting $T_\mathrm{c}$ and unexpectedly strong coupling between the Nd 4$f$ moments and the superfluid. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_05606 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Evolution of the Superfluid Density in Infinite-Layer Nickelates Wang, Bai Yang Harvey, Shannon P. Lee, Kyuho Yu, Yijun Lee, Yonghun Osada, Motoki Murthy, Chaitanya Raghu, Srinivas Hwang, Harold Y. Superconductivity Nickelate superconductors provide a valuable new platform for the study of unconventional superconductivity that is complementary to the cuprates. One of the central puzzles about high-temperature superconductors is what factors determine the scale of their superconducting transition temperature ($T_\mathrm{c}$). To address this question for infinite-layer nickelates, we present a systematic mutual inductance study of the superfluid density across the doping-dependent superconducting dome of $\mathrm{Nd}_{1-x}\mathrm{Sr}_x\mathrm{NiO}_2$. We observe a weak superfluid stiffness that exhibits an approximately square-root correlation with $T_\mathrm{c}$. We also find a strong interplay between Nd magnetism and the superconducting phase, manifested as a substantial low-temperature suppression of superfluid density. These observations highlight the importance of superconducting phase fluctuations in limiting $T_\mathrm{c}$ and unexpectedly strong coupling between the Nd 4$f$ moments and the superfluid. |
| title | Evolution of the Superfluid Density in Infinite-Layer Nickelates |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2603.05606 |