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We report a systematic magnetotransport study of superconductinginfinite-layer nickelate thin films Nd$_{1-x}$Sr$_x$NiO$_2$ with $0.15 \leq x\leq 0.225$. By suppressing superconductivity with out-of-plane magnetic fieldsup to 37.5 T, we find that the normal state resistivity ofNd$_{1-x}$Sr$_x$NiO$_2$ is characterized by a crossover from a metallic$T^2$-behavior to an insulating log(1/$T$)-behavior for all $x$ except $x =0.225$, at which the resistivity is predominantly metallic. Thelog(1/$T$)-behavior is found to be robust against magnetic fields, inconsistentwith scenarios involving localization or Kondo scattering, and points to ananomalous insulating state possibly driven by strong correlations. In themetallic state, we find no evidence for non-Fermi-liquid behavior arising fromproximity to a putative quantum critical point located inside thesuperconducting dome.

Insulator-to-Metal Crossover near the Edge of the Superconducting Dome in Nd$_{1-x}$Sr$_x$NiO$_2$