Coincident onset of charge order and pseudogap in a homogeneous high-temperature superconductor

D. Betto, S. Nakata, F. Pisani, Y. Liu, S. Hameed, M. Knauft, C. T. Lin, R. Sant, K. Kummer, F. Yakhou, N. B. Brookes, M. Tacon, B. Keimer and M. Minola ()
Additional contact information
D. Betto: European Synchrotron Radiation Facility (ESRF), BP 220
S. Nakata: Max Planck Institute for Solid State Research
F. Pisani: European Synchrotron Radiation Facility (ESRF), BP 220
Y. Liu: Max Planck Institute for Solid State Research
S. Hameed: Max Planck Institute for Solid State Research
M. Knauft: Max Planck Institute for Solid State Research
C. T. Lin: Max Planck Institute for Solid State Research
R. Sant: European Synchrotron Radiation Facility (ESRF), BP 220
K. Kummer: European Synchrotron Radiation Facility (ESRF), BP 220
F. Yakhou: European Synchrotron Radiation Facility (ESRF), BP 220
N. B. Brookes: European Synchrotron Radiation Facility (ESRF), BP 220
M. Tacon: Karlsruhe Institute of Technology
B. Keimer: Max Planck Institute for Solid State Research
M. Minola: Max Planck Institute for Solid State Research

Nature Communications, 2025, vol. 16, issue 1, 1-7

Abstract: Abstract Understanding high-temperature superconductivity in cuprates requires knowledge of the metallic phase it evolves from, particularly the pseudogap profoundly affecting the electronic properties at low carrier densities. A key question is the influence of chemical disorder, which is ubiquitous but exceedingly difficult to model. Using resonant X-ray scattering, we identified two-dimensional charge order in stoichiometric YBa2Cu4O8 (Tc = 80 K), which is nearly free of chemical disorder. The charge order amplitude shows a concave temperature dependence and vanishes sharply at T* = 200 K, the onset of a prominent pseudogap previously determined by spectroscopy, suggesting a causal link between these phenomena. The gradual onset of charge order in other cuprates is thus likely attributable to an inhomogeneous distribution of charge ordering temperatures due to disorder induced by chemical substitution. The relationship between the pseudogap and the disorder-induced gradual freeze-out of charge carriers remains a central issue in research on high-Tc superconductors.

Date: 2025
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DOI: 10.1038/s41467-025-58870-8

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