  The discovery of superconductivity in hole-doped infinite layer nickelates,
RNiO2 (R = Nd, Pr, La) has garnered sustained interest in the field. A
definitive picture of low-energy many-body states has not yet emerged. We
provide new insights into the low-energy physics, based on our embedded
dynamical mean-field theory calculations, and propose a correlation
(U)-temperature (T) phase diagram. The key features are a low-T Fermi liquid
(FL) phase, a high-T Curie-Weiss regime, and an antiferromagnetic phase in a
narrow U-T region. We associate the onset of the FL phase with partial
screening of Ni-d moments; however, full screening occurs at lower
temperatures. This may be related to insufficiency of conduction electrons to
effectively screen the Ni-d moments, suggestive of Nozieres Exhaustion
Principle. Our results suggest that RNiO2 are in the paramagnetic state, close
to an antiferromagnetic dome, making magnetic fluctuations feasible. This may
be consequential for superconductivity.
