Superconductivity offers the promise of hyper-efficient electric motors, ultra powerful magnets, and the transmission of electricity without losses. The reality, however, has fallen considerably short of that promise, as superconducting materials are difficult and expensive to manufacture, requiring a constant bath of liquid nitrogen to keep them cold enough to operate. And progress at identifying new high-temperature superconductors went through an extended stall, with no new contenders for decades.
But behind that stall, researchers were getting a better understanding of the physics involved with superconductivity, and that understanding seems to be paying off. A few years back, researchers found that a high-pressure form of hydrogen sulfide would superconduct at 203K (-70°C), roughly 65K higher than any previous material. Now, following up on suggestions from computer modeling, researchers have discovered that a metal-hydrogen compound (LaH10) can superconduct all the way up to 250K. That’s roughly -25°C, a temperature that can be reached by a good freezer.
Unfortunately, its superconductivity is dependent upon pressure and required compressing the sample between two diamonds. But the results do tell us that our understanding is on the right track, and there are undoubtedly additional chemicals worth examining.