Below 110K. Still on the right track but not proof of room temp superconductor yet.
110K (-163C, -262F) is still a significant improvement in cryo temperatures required for superconductivity. It no longer requires liquid helium temperatures for things like MRI magnets. So even if this is not a "holy grail" room temperature SC- it still enables the use of much cheaper commodity cryogenics like liquid nitrogen for use in scientific and industrial superconductors.
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.
honestly i'd be happy with a LN2 superconductor that works for MRI.
Isn't rebco tape already a decent candidate for that, and much further along in development pipelines?
The more independent tests come out the less it's looking like this is a superconductor. There might still be something interesting going on here, but I'm becoming skeptical of the original claims myself.
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-163C is still pretty cold, but at least it is superconducting
