LK-99 is the name of the material that is being hotly debated around the world these days: A Korean research group published results at the end of July 2023 on the preprint server arXiv suggesting that it could be a superconductor even at room temperature and normal atmospheric pressure. Superconductors known to date retain their properties only when either cooled to very low temperatures or subjected to extremely high pressure.
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Source: Phys.org