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

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.

preprint2015arXivOpen access
Arnaud RalkoJaime MerinoSimone Fratini
cond-mat.str-elcond-mat.mtrl-sci
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Arnaud RalkoJaime MerinoSimone Fratini

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