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- W2894960916 abstract "Multiorbital Hubbard models host strongly correlated ``Hund's metals'' even for interactions much stronger than the bandwidth. We characterize this interaction-resilient metal as a mixed-valence state. In particular, it can be pictured as a bridge between two strongly correlated insulators: a high-spin Mott insulator and a charge-disproportionated insulator which is stabilized by a very large Hund's coupling. This picture is confirmed comparing models with negative and positive Hund's coupling for different fillings. Our results provide a characterization of the Hund's metal state and connect its presence with charge disproportionation, which has indeed been observed in chromates and proposed to play a role in iron-based superconductors." @default.
- W2894960916 created "2018-10-12" @default.
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- W2894960916 date "2019-05-07" @default.
- W2894960916 modified "2023-10-09" @default.
- W2894960916 title "Charge Disproportionation, Mixed Valence, and Janus Effect in Multiorbital Systems: A Tale of Two Insulators" @default.
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- W2894960916 doi "https://doi.org/10.1103/physrevlett.122.186401" @default.
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