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We give a brief review of the Mott-Kondo scenario and its consequence in therecently-discovered infinite-layer nickelate superconductors. We argue that theparent state is a self-doped Mott insulator and propose an effective$t$-$J$-$K$ model to account for its low-energy properties. At small doping,the model describes a low carrier density Kondo system with incoherent Kondoscattering at finite temperatures, in good agreement with experimentalobservation of the logarithmic temperature dependence of electric resistivity.Upon increasing Sr doping, the model predicts a breakdown of the Kondo effect,which provides a potential explanation of the non-Fermi liquid behavior of theelectric resistivity with a power law scaling over a wide range of thetemperature. Unconventional superconductivity is shown to undergo a transitionfrom nodeless $(d+is)$-wave to nodal $d$-wave near the critical doping due tocompetition of the Kondo and Heisenberg superexchange interactions. Thepresence of different pairing symmetry may be supported by recent tunnelingmeasurements.

Self-doping and the Mott-Kondo scenario for infinite-layer nickelate superconductors