Superconductors allow electrical current to flow without any resistance—but only below a certain critical temperature. Many materials have to be cooled down to almost absolute zero, while some materials keep their superconducting properties up to much higher temperatures. How this “high-temperature superconductivity” works and how it is possible to develop new materials that are superconductors even at normal room temperature is still one of the great mysteries of modern physics.
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Source: Phys.org