We report the phase diagram of ${\mathrm{Nd}}_{1-x}{\mathrm{Sr}}_x{\mathrm{NiO}}_2$ infinite layer thin films grown on ${\mathrm{SrTiO}}_3$. A superconducting dome spanning $0.125<x<0.25$ is found, remarkably similar to cuprates, albeit over a narrower doping window. However, while cuprate superconductivity is bounded by an insulator for underdoping and a metal for overdoping, here we observe weakly insulating behavior on either side of the dome. Furthermore, the normal state Hall coefficient is always small and proximate to a continuous zero crossing in doping and in temperature, in contrast to the $\sim 1/x$ dependence observed for cuprates. This suggests the presence of both electronlike and holelike bands, consistent with band structure calculations.

• Received 16 March 2020
• Accepted 15 June 2020

DOI:https://doi.org/10.1103/PhysRevLett.125.027001