Local susceptometry reveals a linear relationship between superfluid density and transition temperature in nickelates, suggesting new insights into superconductivity.
A strong correlation between zero-temperature superfluid density (ρs0) and transition temperature (TC) 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 Nd0.8Sr0.2NiO2. The sample shows inhomogeneous ρs0 and TC on micron-scale. The spatial statistics for different scan areas reveal a linear dependence of local TC on ρs0 for TC > 8 K and a sub-linear one for TC < 8 K. Remarkably, the overall relationship is reminiscent of that reported in overdoped cuprate superconductors, hinting at a close connection between them.
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Li et al. (2026) studied this question.
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