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Q: Why do superconductors have to be cold?
By making the material cold there is less energy to knock the electrons around, so their path can be more direct, and they experience less resistance. If the material is cold enough, then there isn’t enough heat energy available to reach that minimum “chunk”. So energy is not passed from the material to the electrons, the electrons don’t get knocked around, and they don’t experience any resistance. Figuring out these tricks and putting them together correctly is what makes new higher temperature superconductors so difficult to invent. It’s worth noting, finally, that the answer above is the most intuitive answer I can come up with, and not the most correct.
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