Get 20M+ Full-Text Papers For Less Than $1.50/day. Subscribe now for You or Your Team.

Learn More →

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

Three-dimensional collective charge excitations in electron-doped copper oxide superconductors High-temperature copper oxide superconductors consist of stacked CuO2 planes, with electronic band structures and magnetic excitations that are primarily two-dimensional 1,2 , 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 3,4 within the limited range of momenta accessible by optics. Here 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 5–7 reveals their charge origin, that is, without mixing with magnetic components 5–7 . 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 8–12 and argued to play a substantial part in mediating high-temperature superconductivity 10–12 . http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Nature Springer Journals

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

Loading next page...
 
/lp/springer-journals/three-dimensional-collective-charge-excitations-in-electron-doped-ibUOXVmF2I

References (44)

Publisher
Springer Journals
Copyright
Copyright © 2018 by Springer Nature Limited
Subject
Science, Humanities and Social Sciences, multidisciplinary; Science, Humanities and Social Sciences, multidisciplinary; Science, multidisciplinary
ISSN
0028-0836
eISSN
1476-4687
DOI
10.1038/s41586-018-0648-3
Publisher site
See Article on Publisher Site

Abstract

High-temperature copper oxide superconductors consist of stacked CuO2 planes, with electronic band structures and magnetic excitations that are primarily two-dimensional 1,2 , 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 3,4 within the limited range of momenta accessible by optics. Here 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 5–7 reveals their charge origin, that is, without mixing with magnetic components 5–7 . 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 8–12 and argued to play a substantial part in mediating high-temperature superconductivity 10–12 .

Journal

NatureSpringer Journals

Published: Oct 31, 2018

There are no references for this article.