Hund Physics Landscape of Two-Orbital Systems

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Motivated by the recent discovery of superconductivity in infinite-layer nickelates RE1-delta Sr delta NiO2 (RE = Nd, Pr), we study the role of Hund 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 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 metal, and valenceskipping metal, fromthe effect of J being away fromMottness. Defining criteria characterizing these metals is suggested, establishing the existence of Hund metallicity in two-orbital systems.
Publisher
AMER PHYSICAL SOC
Issue Date
2021-05
Language
English
Article Type
Article
Citation

PHYSICAL REVIEW LETTERS, v.126, no.20, pp.206401

ISSN
0031-9007
DOI
10.1103/PhysRevLett.126.206401
URI
http://hdl.handle.net/10203/285852
Appears in Collection
PH-Journal Papers(저널논문)
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