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Strongly correlated charge density wave in La2−xSrxCuO4 evidenced by doping-dependent phonon anomaly

DOI: 10.1103/PhysRevLett.124.207005 DOI Help

Authors: J. Q. Lin (Brookhaven National Laboratory; ShanghaiTech University; Institute of Physics, Chinese Academy of Sciences; University of Chinese Academy of Sciences) , H. Miao (Brookhaven National Laboratory) , D. G. Mazzone (Brookhaven National Laboratory) , G. D. Gu (Brookhaven National Laboratory) , A. Nag (Diamond Light Source) , A. C. Walters (Diamond Light Source) , M. Garcia-fernandez (Diamond Light Source) , A. Barbour (National Synchrotron Light Source II) , J. Pelliciari (National Synchrotron Light Source II) , I. Jarrige (National Synchrotron Light Source II) , M. Oda (Hokkaido University) , K. Kurosawa (Hokkaido University) , N. Momono (Muroran Institute of Technology) , K. Zhou (Diamond Light Source; Swiss Light Source) , V. Bisogni (National Synchrotron Light Source II) , X. Liu (ShanghaiTech University) , M. P. M. Dean (Brookhaven National Laboratory)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review Letters , VOL 124

State: Published (Approved)
Published: May 2020
Diamond Proposal Number(s): 22261

Abstract: The discovery of charge-density-wave-related effects in the resonant inelastic x-ray scattering spectra of cuprates holds the tantalizing promise of clarifying the interactions that stabilize the electronic order. Here, we report a comprehensive resonant inelastic x-ray scattering study of La 2 − x Sr x CuO 4 finding that charge-density wave 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 charge-density-wave-induced phonon softening. We interpret our results in terms of a charge-density wave that is generated by strong correlations and a phonon response that is driven by the charge-density-wave-induced modification of the lattice.

Journal Keywords: Charge density waves; Impurities in superconductors; Superconducting fluctuations; Superconducting phase transition; Cuprates; High-temperature superconductors; Resonant inelastic x-ray scattering

Subject Areas: Physics, Materials


Instruments: I21-Resonant Inelastic X-ray Scattering (RIXS)

Other Facilities: National Synchrotron Light Source II