Abstract
Electron doping induces metal-to-insulator transition (MIT) in as realized by experiments. While earlier density functional theory (DFT) studies with static correlations fell short of explaining the recent MIT observations at lower hydrogen concentrations, we present a comprehensive computational investigation employing an advanced approach. We combine DFT with dynamical mean field theory to efficiently analyze the insulating behavior of hydrogen-doped . In contrast to previous theoretical works, our calculations predict an insulator transition occurring at a reduced doping level of H:Ni = 0.5:1. Specifically, while the method reveals a gap opening between orbitals, the DMFT approach highlights a gap opening between orbitals. Our findings uncover a selective Mott transition in site and orbital characteristics, with the Ni ions proximate to the doped hydrogen exhibiting Mott-like traits. Notably, DMFT calculations highlight a pronounced dependence on Hund's parameter , implying the presence of Hundness in the Mott insulator. This study underscores the necessity of accounting for dynamical correlations to accurately describe the electronic structure of strongly correlated electron-doped rare-earth nickelates.
- Received 27 August 2023
- Accepted 25 April 2024
DOI:https://doi.org/10.1103/PhysRevB.109.205124
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