How pressure enhances the critical temperature of superconductivity in YBa₂Cu₃O_6+y.

ABSTRACT: High-temperature superconducting cuprates respond to doping with a dome-like dependence of their critical temperature (T_c). But the family-specific maximum T_c can be surpassed by application of pressure, a compelling observation known for decades. We investigate the phenomenon with high-pressure anvil cell NMR and measure the charge content at planar Cu and O, and with it the doping of the ubiquitous CuO₂ plane with atomic-scale resolution. We find that pressure increases the overall hole doping, as widely assumed, but when it enhances T_c above what can be achieved by doping, pressure leads to a hole redistribution favoring planar O. This is similar to the observation that the family-specific maximum T_c is h

SUBMITTER: Jurkutat M 

PROVIDER: S-EPMC9926205 | biostudies-literature | 2023 Jan

REPOSITORIES: biostudies-literature