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"A team of scientists from the Physics Department of Southeast University, a top university in Nanjing, China, have reported measuring 0 resistance in a samp...
It still loses to HgBa2Ca2Cu3O8+6 with Tc = 133–138 K at normal air pressure, though. (I assume it’s normal air presure as the article doesn’t say the pressure for it, while it refers to some others as high-pressure ones.)
Maybe LK-99 still has other benefits, such as not using mercury.