Detection of Acoustic Plasmons in Hole-Doped Lanthanum and Bismuth Cuprate Superconductors Using Resonant Inelastic X-Ray Scattering

High Tc superconductors show a rich variety of phases associated with their charge degrees of freedom. Valence charges can give rise to charge ordering or acoustic plasmons in these layered cuprate superconductors. While charge ordering has been observed for both hole- and electron-doped cuprates, a...

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Authors: Nag, Abhishek; Zhu, M.; Bejas, Matias Hector; Li, J.; Robarts, H. C.; Yamase, Hiroyuki; Petsch, A. N.; Song, D.; Eisaki, H.; Walters, A. C.; Garciá Fernández, M.; Greco, Andres Francisco; Hayden, Santiago; Zhou, Ke Jin
Format: Article
Status:Published version
Publication date:2020
Country:Argentina
Institution:Consejo Nacional de Investigaciones Científicas y Técnicas
Repository:CONICET Digital (CONICET)
Language:English
OAI Identifier:oai:ri.conicet.gov.ar:11336/151017
Online Access:http://hdl.handle.net/11336/151017
Access Level:Open access
Keyword:Plasmons
Cuprates
https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
Summary:High Tc superconductors show a rich variety of phases associated with their charge degrees of freedom. Valence charges can give rise to charge ordering or acoustic plasmons in these layered cuprate superconductors. While charge ordering has been observed for both hole- and electron-doped cuprates, acoustic plasmons have only been found in electron-doped materials. Here, we use resonant inelastic x-ray scattering to observe the presence of acoustic plasmons in two families of hole-doped cuprate superconductors (La1.84Sr0.16CuO4 and Bi2Sr1.6La0.4CuO6þδ), crucially completing the picture. Interestingly, in contrast to the quasistatic charge ordering which manifests at both Cu and O sites, the observed acoustic plasmons are predominantly associated with the O sites, revealing a unique dichotomy in the behavior of valence charges in hole-doped cuprates.

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