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Formation of Incommensurate Charge Density Waves in Cuprates

  • Although charge density waves (CDWs) are omnipresent in cuprate high-temperature superconductors, they occur at significantly different wave vectors, confounding efforts to understand their formation mechanism. Here, we use resonant inelastic x-ray scattering to investigate the doping- and temperature-dependent CDW evolution in La₂₋ₓBaₓCuO₄ (x=0.115–0.155). We discover that the CDW develops in two stages with decreasing temperature. A precursor CDW with a quasicommensurate wave vector emerges first at high temperature. This doping-independent precursor CDW correlation originates from the CDW phase mode coupled with a phonon and “seeds” the low-temperature CDW with a strongly doping-dependent wave vector. Our observation reveals the precursor CDW and its phase mode as the building blocks of the highly intertwined electronic ground state in the cuprates.

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Author: Hu Miao, Roberto Fumagalli, M. Rossi, José LorenzanaORCiD, Götz SeiboldORCiD, Flora Yakhou-Harris, K. Kummer, Nicholas B. Brookes, G. D. Gu, Lucio Braicovich, Giacomo Claudio Ghiringhelli, M. P. M. Dean
URL:https://journals.aps.org/prx/abstract/10.1103/PhysRevX.9.031042
DOI:https://doi.org/10.1103/PhysRevX.9.031042
ISSN:2160-3308
Title of the source (English):Physical Review X
Document Type:Scientific journal article peer-reviewed
Language:English
Year of publication:2019
Tag:Cuprates; Electrical Properties; Research Areas Charge density waves; Resonant inelastic x-ray scattering; Strongly correlated systems; Superconductivity
Volume/Year:9
Issue number:3
First Page:031042-1
Last Page:031042-11
Faculty/Chair:Fakultät 1 MINT - Mathematik, Informatik, Physik, Elektro- und Informationstechnik / FG Computational Physics
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