Cuprate Superconductivity Beyond the Dome

Cuprate superconductors are one of the most well studied classes of unconventional superconductors, as they possess the highest critical temperatures at ambient pressure. Previous work on cuprates has uncovered a rich phase diagram that varies with hole and electron doping, with a superconducting dome emerging on the hole doping side whose maximum delineates the overdoped (OD) and underdoped (UD) side. The UD side has been widely studied, with many overlapping complex phases, while the OD was thought to be a simple Fermi Liquid. Recent studies, however, have uncovered several cuprate compounds with superconducting behavior extending far beyond the conventional superconducting dome, including high pressure oxygenated (HPO) YBa₂Cu₃O_7+δ (YBCO). In this talk, I will discuss progress on assessing the chemical and electronic properties of this material.