Evidence is growing that a second dome of high-Tc superconductivity can be accessed in the cuprates by increasing the doping beyond the first dome. Here we use \emph{ab initio} methods without invoking any free parameters, such as the Hubbard U, to reveal that pressure could turn YBa2Cu3O7 into an ideal candidate for second-dome-superconductivity, displaying the predicted signature of strongly hybridized dx2−y2 and dz2 orbitals. Notably, pressure is found to induce a phase transition replacing the antiferromagnetic phases with an orbitally-degenerate d--d phase. Our study suggests that the origin of the second dome is correlated with the oxygen-hole fraction in the CuO2 planes and the collapse of the pseudogap phase.
@article{arxiv.2305.05715,
title = {Second Dome of Superconductivity in YBa$_2$Cu$_3$O$_7$ at High Pressure},
author = {Johannes Nokelainen and Matthew E. Matzelle and Christopher Lane and Nabil Atlam and Ruiqi Zhang and Robert S. Markiewicz and Bernardo Barbiellini and Jianwei Sun and Arun Bansil},
journal= {arXiv preprint arXiv:2305.05715},
year = {2025}
}