Metallic hydrogen is predicted to be a room-temperature superconductor. And if my understanding is correct, it is related to the speed of sound ("phonons") in that material. Stressing the material further increases the speed of sound.
However, metallic hydrogen is pretty much theoretical at that point, although it looks like we are getting closer. No other material that I know of had achieved >0°C superconductivity before.
However, metallic hydrogen is pretty much theoretical at that point, although it looks like we are getting closer. No other material that I know of had achieved >0°C superconductivity before.
https://en.wikipedia.org/wiki/Metallic_hydrogen