Superconductivity
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Superconductivity is a phenomenon occurring in certain material generally at very low temperature, characterized by exactly zero electrical resistance and the exclusion of the interior magnetic field (the Meissner effect).
The electrical resistivity of a metallic conductor decreases gradually as the temperature is lowered. However, in ordinary conductors such as copper and silver, impurities and other defects impose a lower limit. Even near absolute zero a real sample of copper shows a non...
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