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- W3129121340 abstract "Motivated by the recent discovery of superconductivity in infinite-layer nickelates RE$_{1-delta}$Sr$_delta$NiO$_2$ (RE$=$Nd, Pr), we study the role of Hund's coupling $J$ in a quarter-filled two-orbital Hubbard model which has been on the periphery of the attention. A region of negative effective Coulomb interaction of this model is revealed to be differentiated from three- and five-orbital models in their typical Hund's metal active fillings. We identify distinctive regimes including four different correlated metals, one of which stems from the proximity to a Mott insulator while the other three, which we call intermediate metal, weak Hund's metal, and valence-skipping metal, from the effect of $J$ being away from Mottness. Defining criteria characterizing these metals are suggested, establishing the existence of Hund's metallicity in two-orbital systems." @default.
- W3129121340 created "2021-02-15" @default.
- W3129121340 creator A5040814439 @default.
- W3129121340 creator A5046376217 @default.
- W3129121340 creator A5065661573 @default.
- W3129121340 date "2021-05-17" @default.
- W3129121340 modified "2023-09-27" @default.
- W3129121340 title "Hund Physics Landscape of Two-Orbital Systems" @default.
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- W3129121340 doi "https://doi.org/10.1103/physrevlett.126.206401" @default.
- W3129121340 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/34110184" @default.
- W3129121340 hasPublicationYear "2021" @default.
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