Observation of zero resistance above 100 K in Pb₁₀₋ₓCuₓ(PO₄)₆O

Pretty cool! The question is how cool?

According to the paper: Tc = 110 K, or around -163 °C. This is still pretty "cool", the existence of room-temperature superconductivity remains unverified. But assuming this paper is true, it means the material would still at least be a legitimate high-temperature superconductor in its own right, and the original claim would probably be cleared from being a deliberate fraud.

Encouraging evidence that the recent work on room temperature superconductivity might be real!

Still waiting for confirmation from multiple labs.

I'm very much conservative about this paper because while the graph in Fig. 3a says $T_c^{zero}$ being 110 K, the "zero" resistance is actually only 1e-5 Ω (!) and even if the sample is possibly superconducting its critical temperature would be much lower than 110 K anyway. I'm aware of the difficulty in obtaining larger samples, but the label in that graph is really misleading regardless.

Cooler than dry ice but less cool than liquid nitrogen.

(Wakka wakka wakka)