[7thzero]

I was curious and did a patent search. This may be it:

https://patents.google.com/patent/US20190348597A1/en (Piezoelectricity-induced High Temperature Superconductor)

[progrus]

Yeah this is referred to in the LK99 paper.

[sohex]

Where? I don't see a reference to it in either of the initial two papers or in the Korean journal paper.