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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)
+ Show Author Affiliations

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:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
Grant/Contract Number:
AC02-05CH11231; AC02-76SF00515
OSTI ID:
1483389
Journal Information:
Nature (London), Journal Name: Nature (London) Journal Issue: 7731 Vol. 563; ISSN 0028-0836
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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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
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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

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