As I understand it, superconductors work best at temperatures approaching absolute zero (-273.15C). For example, Google tells me that the superconductor in an MRI operates at -269C.
There has been a lot a buzz lately about room temperature (25C) superconductors being discovered, but why is room temperature the focus? Why not focus on superconductors that work in reasonably cold environments? For example, we can easily get temperatures to -15C in a freezer. Why not create superconductors that work in that temperature range rather than 25C?
There is a lot of activities around “high temperature supra conductor” high temperature meaning using liquid nitrogen as a cooling fluid. It would already be less a hassle than liquid helium. Some do exists, and the question that interest every industry using supra-conductor is whether the cost saved by switching to liquid nitrogen is worth developing a whole new product with a relatively recent technology.
Room temperature would be a massive breakthrough as suddenly you don’t really need to deal with a cooling system (or may-be a water cooling/fan like any other electric equipment) not only it would ease the life of people aready using super-conducting materials but it would also allow to use it in more cases (Maglev, electric motor)
Research looks into any and all superconductors all the time. The buzz right now is because a new one was potentially found, and it happens to function at room temperature. Discoveries don’t happen on a schedule. If a superconductor was discovered that functioned at -15C, that would be huge news too as I believe the current warmest ambient pressure superconductor needs -140C to transition.
For a lot of use cases, they need to be viable completely outside of any containment.
If you create a superconductor that needs -30C to function, you can’t use it in consumer electronics because it would make them too large. If you create a superconductor that needs -10C to function, you can’t use it to transmit power over long distances
Don’t get this wrong though, scientists have been working on finding ANY superconductors in the hope of eventually being able to reach the end goal of a room temperature type. There are still unknown mechanisms that cause super conduction, so any breakthrough usually helps us find more possible candidates.
