Superconductivity is a phenomenon of exactly zero electrical resistance and expulsion of magnetic fields occurring in certain materials when cooled below a characteristic critical temperature. 

Superconducting is preferable to "superconductive" as an adjective (though both are technically correct). 

The superconducting wires on the Large Hadron Collider are maintained at 1.9 K (-271.3°C) – colder than outer space – by a closed liquid-helium circuit.


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