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

Abstract

We give a brief review of the Mott-Kondo scenario and its consequence in the recently-discovered infinite-layer nickelate superconductors. We argue that the parent 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 Kondo scattering at finite temperatures, in good agreement with experimental observation 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 the electric resistivity with a power law scaling over a wide range of the temperature. Unconventional superconductivity is shown to undergo a transition from nodeless $(d+is)$-wave to nodal $d$-wave near the critical doping due to competition of the Kondo and Heisenberg superexchange interactions. The presence of different pairing symmetry may be supported by recent tunneling measurements.

8 pages, 6 figures

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• Synthesis and physical properties of LaNiO${}_2$ crystals
• An electronic origin of charge order in infinite-layer nickelates
• Quantifying interaction mechanism in infinite layer nickelate superconductors
• Large upper critical fields and dimensionality crossover of superconductivity in infinite-layer nickelate La${}_{0.8}$Sr${}_{0.2}$NiO${}_2$
• Realization of Kagome Kondo lattice
• Distinct electridelike nature of infinite-layer nickelates and the resulting theoretical challenges to calculate their electronic structure
• Scanning SQUID study of ferromagnetism and superconductivity in infinite-layer nickelates
• Magnetism in doped infinite-layer NdNiO2 studied by combined density functional theory and dynamical mean-field theory
• DFT+DMFT study of correlated electronic structure in the monolayer-trilayer phase of La${}_3$Ni${}_2$O${}_7$
• An emerging global picture of heavy fermion physics
• Comparison of superconducting pairing in doped cuprates and nickelates within an extended Hubbard model