Universal Waterfall Feature in Cuprate Superconductors: Evidence of a Momentum-Driven Crossover
Benjamin Bacq-Labreuil, Chafic Fawaz, Yuichi Okazaki, Yukiko Obata, Hervé Cercellier, Patrick Le Fèvre, François Bertran, David Santos-Cottin, Hajime Yamamoto, Ikuya Yamada, Masaki Azuma, Koji Horiba, Hiroshi Kumigashira, Matteo d’Astuto, Silke Biermann, Benjamin Lenz
DOI 10.1103/PhysRevLett.134.016502 · Physical Review Letters
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Abstract
We study two related universal anomalies of the spectral function of cuprates, so-called waterfall and high-energy kink features, by a combined cellular dynamical mean-field theory and angle-resolved photoemission study for the oxychloride NaxCa2−xCuO2Cl2 (Na-CCOC). Tracing their origin back to an interplay of spin-polaron and local-correlation effects both in undoped and hole-doped (Na-)CCOC, we establish them as a universal crossover between regions differing in the momentum dependence of the coupling and not necessarily in the related quasiparticles’ energies. The proposed scenario extends to doping levels coinciding with the cuprate’s superconducting dome and motivates further investigations of the fate of spin polarons in the superconducting phase.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NaxCa2-xCuO2Cl2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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