Charge-Transfer Excitations in the Model Superconductor HgBa${}_2$CuO${}_{4+\delta }$

Abstract

We report a Cu $K$-edge resonant inelastic x-ray scattering (RIXS) study of charge-transfer excitations in the 2-8 eV range in the structurally simple compound HgBa${}_2$CuO${}_{4+\delta }$ at optimal doping ($T_{\mathrm{c}}=96.5$ K). The spectra exhibit a significant dependence on the incident photon energy which we carefully utilize to resolve a multiplet of weakly-dispersive ($<0.5$ eV) electron-hole excitations, including a mode at 2 eV. The observation of this 2 eV excitation suggests the existence of a charge-transfer pseudogap deep in the superconducting phase. Quite generally, our data demonstrate the importance of exploring the incident photon energy dependence of the RIXS cross section.

arXiv comment5 pages, 3 figures

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Cited by in corpus (30)

• Resonant Inelastic X-ray Scattering Studies of Elementary Excitations
• Synchrotron x-ray scattering study of charge-density-wave order in HgBa${}_2$CuO${}_{4+\delta }$
• Demonstrating the model nature of the high-temperature superconductor HgBa${}_2$CuO${}_{4+\Delta }$
• Intermediate Coupling Model of the Cuprates
• Angle-resolved photoemission spectroscopy study of HgBa${}_2$CuO${}_{4+\delta }$
• Unraveling the Nature of Charge Excitations in La${}_2$CuO${}_4$ with Momentum-Resolved Cu $K$-edge Resonant Inelastic X-ray Scattering
• Theory for Time-Resolved Resonant Inelastic X-ray Scattering
• Optical and thermodynamic properties of the high-temperature superconductor HgBa_2CuO_4+delta
• Magnetic nature of the 500 meV peak in $\mathrm{L}{\mathrm{a}}_{2-\mathrm{x}}\mathrm{S}{\mathrm{r}}_{\mathrm{x}}\mathrm{Cu}{\mathrm{O}}_4$ observed with resonant inelastic x-ray scattering at the Cu $K$-edge
• Charge-transfer exciton in La2CuO4 probed with resonant inelastic x-ray scattering
• Incident-energy and polarization dependent RIXS study of La2CuO4
• Resonant inelastic x-ray scattering in electronically quasi-zero-dimensional CuB2O4
• Doping-Dependent Raman Resonance in the Model High-Temperature Superconductor HgBa2CuO4+d
• Momentum dependent light scattering in insulating cuprates
• Doping dependence of magnetic excitations of 1D cuprates as probed by Resonant Inelastic x-ray Scattering
• 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
• Polarization dependence and symmetry analysis in indirect K-edge RIXS
• Comparison of Resonant Inelastic X-Ray Scattering Spectra and Dielectric Loss Functions in Copper Oxides
• Resonant inelastic X-ray scattering study of overdoped La${}_{2-x}$Sr${}_x$CuO${}_4$
• Growth and characterization of HgBa2CaCu2O6+d and HgBa2Ca2Cu3O8+d crystals
• Resonant inelastic X-ray scattering study of intra-band charge excitations in hole-doped high-Tc cuprates
• Charge-transfer and Mott-Hubbard Excitations in FeBO3: Fe K edge Resonant Inelastic X-ray Scattering Study
• Three interaction energy scales in single-layer high-T${}_C$ cuprate HgBa${}_2$CuO${}_{4+\delta }$
• Coexisting pseudogap, charge transfer gap, and Mott gap energy scales in the resonant inelastic x-ray scattering spectra of electron-doped cuprates
• Analysis of Incident-Photon-Energy and Polarization Dependent Resonant Inelastic X-Ray Scattering from La${}_2$CuO${}_4$
• Post-growth annealing effects on charge and spin excitations in Nd${}_{2-x}$Ce${}_x$CuO${}_4$
• Charge Excitations in Cuprate and Nickelate in Resonant Inelastic X-Ray Scattering
• Momentum-resolved charge excitations in high-Tc cuprates studied by resonant inelastic x-ray scattering
• Analysis of Resonant Inelastic X-Ray Scattering in Stripe-Ordered Nickelate