From basic properties to the Mott design of correlated delafossites

Abstract

The natural-heterostructure concept realized in delafossites highlights these layered oxides. While metallic, band- or Mott-insulating character may be associated with individual layers, inter-layer coupling still plays a decisive role. We review the correlated electronic structure of PdCoO${}_2$, PdCrO${}_2$ and AgCrO${}_2$, showing that layer-entangled electronic states can deviate from standard classifications of interacting systems. This finding opens up possibilities for materials design in a subtle Mott-critical regime. Manipulated Hidden-Mott physics, correlation-induced semimetallicity, or Dirac/flat-band dispersions in a Mott background are emerging features. Together with achievements in the experimental preparation, this inaugurates an exciting research field in the arena of correlated materials.

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• Anomalous Hall effect at the spontaneously electron-doped polar surface of PdCoO2 ultrathin films
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• Magnetic frustration and spontaneous rotational symmetry breaking in PdCrO2
• Spatial inhomogeneity and the metal-insulator transition in Ca${}_3$(Ru${}_{1-x}$Ti${}_x$)${}_2$O${}_7$
• Theoretical design of highly correlated electron states in delafossite heterostructures
• Skew band structure and anomalous conductivity of PdCrO${}_2$
• Twisted double-layer chiral spin structures in anti-ferromagnetic delafossite PdCrO${}_2$
• In situ modification of delafossite type PdCoO2 bulk single crystal for reversible hydrogen sorption and fast hydrogen evolution

Cited by in corpus (9)

• Dynamical Mean Field Studies of Infinite Layer Nickelates: Physics Results and Methodological Implications
• Metallic delafossite thin films for unique device applications
• Chemical Principles of Intrinsic Topological Superconductors
• Avoided metallicity in a hole-doped Mott insulator on a triangular lattice
• Investigation of Planckian behavior in a high-conductivity oxide: PdCrO${}_2$
• Spontaneous layer selective Mott phase in the bilayer Hubbard model
• Probing hidden Mott gap and incommensurate charge modulation on the polar surfaces of PdCrO${}_2$
• Low-temperature transport in high-conductivity correlated metals: a density-functional plus dynamical mean-field study of cubic perovskites
• Revisiting the metal-to-metal transition in $2H$-AgNiO${}_2$