Room Temperature, Ambient Pressure Superconductivity–This Time for Real?

In a paper posted on arXiv on 2023-07-23, three researchers from the Quantum Energy Research Centre, Inc. and KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul, South Korea, report the production and test of a lead-apatite material which they claim exhibits all of the phenomena of superconductivity at room temperatures and above (they state its critical temperature, below which it is a superconductor, as 400 K, or 127° C) and ambient atmospheric pressure at se...