Charge and orbital excitations in Li2CuO2

Abstract

We report a resonant inelastic x-ray scattering study of electronic excitations in Li_2CuO_2, an insulating compound comprised of ribbons of edge-sharing copper-oxygen chains. Three excitations, which show little dependence on momentum transfer, are observed in our measurements. The lowest energy excitation at ~2.1 eV is dispersionless and is attributed to a localized d-d orbital excitation. We also observe two excitations at ~5.4 eV and ~7.6 eV which we assign to charge-transfer excitations. These high-energy excitations are also dispersionless along the copper-oxygen chain direction. However, in each case we observe a small energy dispersion along the direction perpendicular to the copper-oxygen ribbons, suggesting a significant interchain coupling in this system. We also discuss the possible implications of ferromagnetic nearest-neighbor intrachain coupling on the charge excitation spectra.

7 pages, 5 figures

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Cited by in corpus (14)

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• On the absence of a spiral magnetic order in Li2CuO2 with one-dimensional CuO2 ribbon chains
• Charge-orbital-lattice coupling effects in the dd-excitation profile of one dimensional cuprates
• Mott gap excitations in twin-free YBa2Cu3O7-d (Tc = 93 K) studied by RIXS
• Cu $K$-edge Resonant Inelastic X-Ray Scattering in Edge-Sharing Cuprates
• Temperature dependent optical conductivity of undoped cuprates with weak exchange
• Resonant inelastic x-ray scattering in electronically quasi-zero-dimensional CuB2O4
• Polarization-analyzed resonant inelastic x-ray scattering of the orbital excitations in KCuF3
• Molecular orbital excitations in cuprates
• Lattice coupling and Franck-Condon effects in K-edge resonant inelastic X-ray scattering
• Momentum Dependent Charge Excitations of Two-Leg Ladder: Resonant Inelastic X-ray Scattering of (La,Sr,Ca)14Cu24O41
• Probing inter- and intrachain Zhang-Rice excitons in Li${}_2$CuO${}_2$ and determining their binding energy
• Resonant inelastic X-ray scattering study of overdoped La${}_{2-x}$Sr${}_x$CuO${}_4$