Pinball liquid phase from Hund's coupling in frustrated transition metal oxides

Abstract

The interplay of non-local Coulomb repulsion and Hund's coupling in the d-orbital manifold in frustrated triangular lattices is analyzed by a mutliband extended Hubbard model. We find a rich phase diagram with several competing phases, including a robust pinball liquid phase, which is an unconventional metal characterized by threefold charge order, bad metallic behavior and the emergence of high spin local moments. Our results naturally explain the anomalous charge-ordered metallic state observed in the triangular layered compound AgNiO2. The potential relevance to other triangular transition metal oxides is discussed.

arXiv comment4 pages, 4 figures

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Cited by in corpus (7)

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• Noncollinear and noncoplanar magnetic order in the extended Hubbard model on anisotropic triangular lattice
• Doping a Wigner-Mott insulator: Exotic charge orders in transition-metal dichalcogenide moiré heterobilayers
• Multiorbital kinetic effects on charge ordering of frustrated electrons on the triangular lattice
• Particle-Hole Asymmetry and Pinball Liquid in a Triangular-Lattice Extended Hubbard Model within Mean-Field Approximation