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High-temperature superconducting cuprates respond to doping with a dome-likedependence of their critical temperature ($T_{\mathrm{c}}$). But the familyspecific maximum $T_\mathrm{c}$ can be surpassed by application of pressure, acompelling observation known for decades. We investigate the phenomenon withhigh-pressure anvil cell nuclear magnetic resonance (NMR) and measure thecharge content at planar Cu and O, and with it the doping of the ubiquitousCuO$_2$ plane with atomic scale resolution. We find that pressure increases theoverall doping, as widely assumed, but when it enhances $T_\mathrm{c}$ abovewhat can be achieved by doping, it leads to a hole redistribution favoringplanar O. This is similar to the observation that the family-specific maximum$T_\mathrm{c}$ also increases if the hole content at planar O is raised at theexpense of that at planar Cu. Thus, the pressure-induced enhancement of$T_\mathrm{c}$ points to the same mechanism.

How pressure enhances the critical temperature of superconductivity in YBa$_2$Cu$_3$O$_{6+y}$