[airgapstopgap]

No, there's no YB and they propose an entirely novel mechanism for how generic metals (a whole host of possible combinations) can achieve superconductivity in these conditions. At least check out the formula or open the link.

> modified lead-apatite (LK-99) structure

> The superconductivity of LK-99 originates from minute structural distortion by a slight volume shrinkage (0.48 %), not by external factors such as temperature and pressure. The shrinkage is caused by Cu2+ substitution of Pb2+ (2) ions in the insulating network of Pb(2)-phosphate and it generates the stress.

> Pb10(PO4)6O

It's just Lead, Phosphorus and Oxygen all the way.

(That said I don't believe it works)

[ChemSpider]

For me, that is what I would call "just bake something together", the YBCO way.

That said, I see now that I should have made this point clearer. See below for my comment with C60. That was a truly different approach (that failed).