Correlation between superfluid density and transition temperature in infinite-layer nickelate superconductor $Nd_{1-x}Sr_xNiO_2$
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arXiv
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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| _version_ | 1866912831937445888 |
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| author | Li, Z. J. Zhang, R . Z. Xu, M. H. Liang, K. Y. Zhao, Y. He, Q. S. Zhou, Q. Z. Chen, B. R. Zhang, P. H. Yao, K. Z. Yao, H. X. Qiao, L. Wang, Y. H. |
| author_facet | Li, Z. J. Zhang, R . Z. Xu, M. H. Liang, K. Y. Zhao, Y. He, Q. S. Zhou, Q. Z. Chen, B. R. Zhang, P. H. Yao, K. Z. Yao, H. X. Qiao, L. Wang, Y. H. |
| contents | A strong correlation between zero-temperature superfluid density ($ρ_{s0}$) and transition temperature ($T_c$) is considered as a hallmark of unconventional superconductivity. However, their relationship has yet to be unveiled in nickelates due to sample inhomogeneity. Here we perform local susceptometry on an infinite-layer nickelate superconductor $Nd_{0.8}Sr_{0.2}NiO_2$. The sample shows inhomogeneous superfluid density and $T_c$ on micron-scale. The spatial statistics for different scan areas reveal a linear dependence of local $T_c$ on $ρ_{s0}$ for $T_c$>8 K and a sub-linear one for $T_c$<8 K. Remarkably, the overall relationship is reminiscent of that reported in overdoped cuprate superconductors, hinting at a close connection between them. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_12676 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Correlation between superfluid density and transition temperature in infinite-layer nickelate superconductor $Nd_{1-x}Sr_xNiO_2$ Li, Z. J. Zhang, R . Z. Xu, M. H. Liang, K. Y. Zhao, Y. He, Q. S. Zhou, Q. Z. Chen, B. R. Zhang, P. H. Yao, K. Z. Yao, H. X. Qiao, L. Wang, Y. H. Superconductivity A strong correlation between zero-temperature superfluid density ($ρ_{s0}$) and transition temperature ($T_c$) is considered as a hallmark of unconventional superconductivity. However, their relationship has yet to be unveiled in nickelates due to sample inhomogeneity. Here we perform local susceptometry on an infinite-layer nickelate superconductor $Nd_{0.8}Sr_{0.2}NiO_2$. The sample shows inhomogeneous superfluid density and $T_c$ on micron-scale. The spatial statistics for different scan areas reveal a linear dependence of local $T_c$ on $ρ_{s0}$ for $T_c$>8 K and a sub-linear one for $T_c$<8 K. Remarkably, the overall relationship is reminiscent of that reported in overdoped cuprate superconductors, hinting at a close connection between them. |
| title | Correlation between superfluid density and transition temperature in infinite-layer nickelate superconductor $Nd_{1-x}Sr_xNiO_2$ |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2601.12676 |