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 pronounced coupling between the Nd $4f$ moments and the superfluid.

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• Superfluid density
• Nickelates
• Superconductors
• Thin films