If hopes were dwindling for LK-99 to be a room-temperature superconductor, recent findings have now confirmed that it is in fact an insulator. The initial excitement surrounding the substance was fueled by impurities in the samples, with subsequent studies disproving its superconductor-like properties. The Korean team behind the discovery had claimed that LK-99, made of lead, copper, phosphorus, and oxygen, exhibited characteristics of superconductors. However, it seems that their claims were unsubstantiated. The use of a preprint server for their initial publication raised doubt about the validity of their findings.
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