Saturation of superconductivity in cuprates overdoped with high-pressure oxygen: Phase diagram with YBa2Cu3O7+δ, δ → 1

Proceedings of the National Academy of Sciences, Volume 123, Issue 10, March 2026. <br/>SignificanceAlthough overdoped superconducting cuprates were prepared by reaction with high-pressure oxygen shortly after the discovery of high temperature superconductivity (HTSC), they never became widespread, leaving the “dome” of superconductivity in …