Abstract
The novel nickelate superconductors of infinite-layer type feature challenging electronic pecularities in the normal-state phase diagram with doping. Distinct many-body behavior and different dispersion regimes of the entangled , Ni- orbital sector give rise to highly rich physics, which is here studied for the case of the system. An analysis based on advanced realistic dynamical mean-field theory unveils that the superconducting hole-doped region is the meeting place of a (self-)doped Mott insulator from the underdoped side, and a bad Hund metal from the overdoped side. Fermi-level crossing of the Ni- flat-band ties both regimes together to form a singular arena for unconventional superconductivity. We furthermore shed light on the intriguing problem of elusive magnetism in infinite-layer nickelates. Antiferromagnetic (AFM) order with small Ni moments is shown to be a vital competitor at low temperature. At stoichiometry, C-AFM order with ferromagnetic spin-alignment along the -axis benefits from a conceivable coexistence with Kondo(-lattice) screening.
5 More- Received 20 December 2020
- Revised 18 March 2021
- Accepted 13 April 2021
DOI:https://doi.org/10.1103/PhysRevMaterials.5.044803
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