It’s official: LK-99 isn’t a room-temperature superconductor

If there was any hope remaining that LK-99 might be a room-temperature superconductor, it’s pretty much dead now.
In fact, it’s worse than that. Pure samples of the substance show that it is an insulator — the opposite of a superconductor. The glimmers of hope that kept the story in the news for weeks appear to be the result of impurities in the original samples.
Dozens of studies published in the last week or two have coalesced around the conclusion, less than a month after a sensational preprint paper was published by a team at the Quantum Energy Research Centre, a small company housed in th

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