In low-temperature (liquid helium) superconductors electrons start slightly sticking to each other. This makes their energy spectrum quantized (I mean, even more than usual), so to transfer any energy to electrons it has to be in a large enough chunk to kick them apart.
And cold atoms don't have enough thermal energy to do that, so there's no energy transfer between atoms and electron pairs.
In high-temperature superconductors (liquid nitrogen) something similar happens, but the exact mechanism is still unknown.
And cold atoms don't have enough thermal energy to do that, so there's no energy transfer between atoms and electron pairs.
In high-temperature superconductors (liquid nitrogen) something similar happens, but the exact mechanism is still unknown.