Description
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.
