Electron-lattice interactions strongly renormalize the charge transfer energy in the spin-chain cuprate Li${}_2$CuO${}_2$

Abstract

Strongly correlated insulators are broadly divided into two classes: Mott-Hubbard insulators, where the insulating gap is driven by the Coulomb repulsion $U$ on the transition-metal cation, and charge-transfer insulators, where the gap is driven by the charge transfer energy $\Delta$ between the cation and the ligand anions. The relative magnitudes of $U$ and $\Delta$ determine which class a material belongs to, and subsequently the nature of its low-energy excitations. These energy scales are typically understood through the local chemistry of the active ions. Here we show that the situation is more complex in the low-dimensional charge transfer insulator Li${}_2$CuO${}_2$, where $\Delta$ has a large non-electronic component. Combining resonant inelastic x-ray scattering with detailed modeling, we determine how the elementary lattice, charge, spin, and orbital excitations are entangled in this material. This results in a large lattice-driven renormalization of $\Delta$, which significantly reshapes the fundamental electronic properties of Li${}_2$CuO${}_2$.

Nature Communications, in press

References in corpus (7)

• Spin-Orbital Separation in the quasi 1D Mott-insulator Sr2CuO3
• A Systematic Study of Electron-Phonon Coupling to Oxygen Modes Across the Cuprates
• Self-doping processes between planes and chains in the metal-to-superconductor transition of YBa2Cu3O6.9
• Unraveling the Nature of Charge Excitations in La${}_2$CuO${}_4$ with Momentum-Resolved Cu $K$-edge Resonant Inelastic X-ray Scattering
• Observation of phonons with resonant inelastic x-ray scattering
• Temperature dependent optical conductivity of undoped cuprates with weak exchange
• Single-crystal growth and dependences on the hole concentration and magnetic field of the magnetic ground state in the edge-sharing CuO${}_2$ chain system Ca${}_{2+x}$Y${}_{2-x}$Cu${}_5$O${}_{10}$

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