paper

An electronic origin of charge order in infinite-layer nickelates

arXiv:2204.12208 · doi:10.1038/s41467-023-41236-3

Abstract

A charge order (CO) with a wavevector is observed in infinite-layer nickelates. Here we use first-principles calculations to demonstrate a charge-transfer-driven CO mechanism in infinite-layer nickelates, which leads to a characteristic Ni-Ni-Ni stripe state. For every three Ni atoms, due to the presence of near-Fermi-level conduction bands, Hubbard interaction on Ni- orbitals transfers electrons on one Ni atom to conduction bands and leaves electrons on the other two Ni atoms to become more localized. We further derive a low-energy effective model to elucidate that the CO state arises from a delicate competition between Hubbard interaction on Ni- orbitals and charge transfer energy between Ni- orbitals and conduction bands. With physically reasonable parameters, CO state is more stable than uniform paramagnetic state and usual checkerboard antiferromagnetic state. Our work highlights the multi-band nature of infinite-layer nickelates, which leads to some distinctive correlated properties that are not found in cuprates.

29 pages and 5 figures

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