> I'm curious by what measure you suggest it's "too cold". I'm accustomed to thinking about superconductors in an environment on the order of around ~0.01K. A

> I'm curious by what measure you suggest it's "too cold". I'm accustomed to thinking about superconductors in an environment on the order of around ~0.01K. And, it's worth spending a little time understanding absolute temperature. Take, say, Zirconium -- its critical temperature is around 0.55K. This new material's Tc is around 40/.55 = 73 times hotter. This perspective is useful if you're thinking about how much work it'll be to get something down to a given temperature. So you've kinda hit my complaint on the head -- it's precisely because temperatures of that magnitude don't make sense to me. And I'd expect folks reading phys.org to be unsurprised by temperatures reported in K.