Fate of charge order in overdoped La-based cuprates

Abstract

In high-temperature cuprate superconductors, stripe order refers broadly to a coupled spin and charge modulation with a commensuration of eight and four lattice units, respectively. How this stripe order evolves across optimal doping remains a controversial question. Here we present a systematic resonant inelastic x-ray scattering (RIXS) study of weak charge correlations in La2-xSrxCuO4 (LSCO) and La1.8-xEu0.2SrxCuO4 (LESCO). Ultra high energy resolution experiments demonstrate the importance of the separation of inelastic and elastic scattering processes. Upon increasing doping x, the long-range temperature dependent stripe order is found to be replaced by short-range temperature independent correlations at a critical point xc = 0.15 distinct from the pseudogap critical doping. We argue that the doping and temperature independent short-range correlations originate from unresolved electron-phonon coupling that broadly peaks at the stripe ordering vector. In LSCO, long-range static stripe order vanishes in a quantum critical point around optimal doping.

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• Fate of charge order in overdoped La-based cuprates
• From non-metal to strange metal at the stripe-percolation transition in La${}_{2-x}$Sr${}_x$CuO${}_4$
• Magnon interactions in a moderately correlated Mott insulator
• Robust Charge-Density Wave Correlations in Optimally-Doped YBa2Cu3Oy
• Monte Carlo study of cuprate superconductors in a four-band $d$-$p$ model: Role of orbital degrees of freedom
• Charge density waves and pinning by lattice anisotropy in 214 cuprates
• Spin-stripe order tied to the pseudogap phase in La1.8-xEu0.2SrxCuO4
• A Theoretical Study of Doping Evolution of Phonons in High-Temperature Cuprate Superconductors
• The influence of phonon symmetry and electronic structure on the electron-phonon coupling momentum dependence in cuprates
• The doping evolution of the charge density wave and charge density fluctuations in La${}_{2-x}$Sr${}_x$CuO${}_4$
• Laser-Induced Commensurate-Incommensurate Transition of Charge Order in a Hubbard Superlattice