Nature of the charge-density wave excitations in cuprates

Abstract

The discovery of charge-density wave (CDW)-related effects in the resonant inelastic x-ray scattering (RIXS) spectra of cuprates holds the tantalizing promise of clarifying the interactions that stabilize the electronic order. Here, we report a comprehensive RIXS study of La2-xSrxCuO4 (LSCO) finding that CDW effects persist up to a remarkably high doping level of x = 0.21 before disappearing at x = 0.25. The inelastic excitation spectra remain essentially unchanged with doping despite crossing a topological transition in the Fermi surface. This indicates that the spectra contain little or no direct coupling to electronic excitations near the Fermi surface, rather they are dominated by the resonant cross-section for phonons and CDW-induced phonon-softening. We interpret our results in terms of a CDW that is generated by strong correlations and a phonon response that is driven by the CDW-induced modification of the lattice.

7 pages including references in long format

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• Superconducting coherence lengths of hole-doped cuprates obtained from electron-boson spectral density functions
• Low-energy quasi-circular electron correlations with charge order wavelength in ${\text{Bi}}_2{\text{Sr}}_2\text{Ca}{\text{Cu}}_2{\text{O}}_{8+\delta }$
• Structure of Charge Density Waves in La${}_{1.875}$Ba${}_{0.125}$CuO${}_4$
• Anomalous softening of phonon-dispersion in cuprate superconductors
• Theory of electron-phonon interactions in extended correlated systems probed by resonant inelastic x-ray scattering
• Quantum fluctuations of charge order induce phonon softening in a superconducting cuprate
• Capping effects on spin and charge excitations in parent and superconducting Nd1-xSrxNiO2
• Localized character of charge excitations for La${}_{2-x}$Sr${}_x$NiO${}_{4+\delta }$ revealed by oxygen $K$-edge resonant inelastic X-ray scattering
• Bulk charge density wave and electron-phonon coupling in superconducting copper oxychlorides
• A Theoretical Study of Doping Evolution of Phonons in High-Temperature Cuprate Superconductors
• Evolution of the magnetic excitations in electron-doped ${\mathrm{La}}_{2-x}{\mathrm{Ce}}_x{\mathrm{CuO}}_4$
• Pseudogap phase and fractionalization: Predictions for Josephson junction setup
• Exploring charge and spin fluctuations in infinite-layer cuprate SrCuO${}_2$ from a phonon perspective
• Dynamic charge order from strong correlations in the cuprates
• Magnetic excitations in infinite-layer nickelates
• A light-induced charge order mode in a metastable cuprate ladder
• The doping evolution of the charge density wave and charge density fluctuations in La${}_{2-x}$Sr${}_x$CuO${}_4$
• The influence of phonon symmetry and electronic structure on the electron-phonon coupling momentum dependence in cuprates
• Bimagnon dispersion of La2CuO4 probed by resonant inelastic X-ray scattering
• Superconducting phase diagram of multi-layer square-planar nickelates