Ambient-Pressure Superconductivity Achieved in Hg1223 via Pressure-Quenching
Physicists achieved a metastable superconducting state in the cuprate Hg1223 at ambient pressure by rapidly releasing pressure after compressing it to 30 GPa in a diamond-anvil cell, reaching roughly −122 °C—the highest ambient-pressure superconducting temperature to date; confirmed by Advanced Photon Source analysis and reported in PNAS, this advances the quest for room-temperature superconductivity but practical devices remain distant.