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Title: Three-dimensional collective charge excitations in electron-doped copper oxide superconductors

Journal Article · · Nature (London)
 [1];  [1];  [2];  [3];  [3];  [1];  [4];  [4];  [5];  [6];  [7];  [1];  [1];  [1];  [7];  [8];  [9];  [1];  [1];  [1]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Stanford Univ., CA (United States). Dept. of Physics
  3. Politecnico di Milano, Milano (Italy). Dipartimento di Fisica
  4. European Synchrotron Radiation Facility (ESRF), Grenoble (France)
  5. Binghamton Univ., NY (United States). Dept. of Physics
  6. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
  7. Univ. of Maryland, College Park, MD (United States). Center for Nanophysics and Advanced Materials, Dept. of Physics
  8. Politecnico di Milano, Milano (Italy). Dipartimento di Fisica; European Synchrotron Radiation Facility (ESRF), Grenoble (France)
  9. Politecnico di Milano, Milano (Italy). Dipartimento di Fisica; Consiglio Nazionale Delle Ricerche-Istituto SPIN, Genova (Italy)

High-temperature copper oxide superconductors consist of stacked CuO2 planes, with electronic band structures and magnetic excitations that are primarily two-dimensional1,2, but with superconducting coherence that is three-dimensional. This dichotomy highlights the importance of out-of-plane charge dynamics, which has been found to be incoherent in the normal state within the limited range of momenta accessible by optics. Here in this study, we use resonant inelastic X-ray scattering to explore the charge dynamics across all three dimensions of the Brillouin zone. Polarization analysis of recently discovered collective excitations (modes) in electron-doped copper oxides reveals their charge origin, that is, without mixing with magnetic components. The excitations disperse along both the in-plane and out-of-plane directions, revealing its three-dimensional nature. The periodicity of the out-of-plane dispersion corresponds to the distance between neighbouring CuO2 planes rather than to the crystallographic c-axis lattice constant, suggesting that the interplane Coulomb interaction is responsible for the coherent out-of-plane charge dynamics. The observed properties are hallmarks of the long-sought ‘acoustic plasmon’, which is a branch of distinct charge collective modes predicted for layered systems and argued to play a substantial part in mediating high-temperature superconductivity.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; National Science Foundation (NSF)
Grant/Contract Number:
AC02-76SF00515; AC02-05CH11231
OSTI ID:
1483389
Journal Information:
Nature (London), Vol. 563, Issue 7731; ISSN 0028-0836
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 69 works
Citation information provided by
Web of Science

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Cited By (18)

Hydrogenation Dynamics of Electrically Controlled Metal–Insulator Transition in Proton‐Gated Transparent and Flexible WO 3 Transistors journal June 2019
Bioinspired Metamaterials: Multibands Electromagnetic Wave Adaptability and Hydrophobic Characteristics journal August 2019
Screening of Coulomb interactions in holography journal April 2019
Holographic fundamental matter in multilayered media journal December 2019
Doping evolution of the charge excitations and electron correlations in electron-doped superconducting La2−xCexCuO4 journal January 2020
Emergence of pseudogap from short-range spin-correlations in electron-doped cuprates journal January 2020
High-temperature superconductivity in monolayer Bi2Sr2CaCu2O8+δ journal October 2019
Origin of high-energy charge excitations observed by resonant inelastic X-ray scattering in cuprate superconductors journal January 2019
Dynamical charge susceptibility in the Hubbard model journal December 2019
Polarization-resolved Cu L 3 -edge resonant inelastic x-ray scattering of orbital and spin excitations in NdBa 2 Cu 3 O 7 δ journal April 2019
Characterization of the soft X-ray spectrometer PEAXIS at BESSY II text January 2019
Emergence of pseudogap from short-range spin-correlations in electron doped cuprates text January 2018
Crossover of Charge Fluctuations across the Strange Metal Phase Diagram text January 2019
Doping evolution of the charge excitations and electron correlations in electron-doped superconducting La$_{2-x}$Ce$_{x}$CuO$_{4}$ text January 2019
Holographic fundamental matter in multilayered media text January 2019
Superconductivity in the three-band model of cuprates: nodal direction characteristics and influence of intersite interactions journal August 2021
Detection of Acoustic Plasmons in Hole-Doped Lanthanum and Bismuth Cuprate Superconductors Using Resonant Inelastic X-Ray Scattering text January 2020
Plasmonic Waveguides from Coulomb-Engineered Two-Dimensional Metals text January 2021

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