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La superconductivitat és la propietat de certs materials de conduir un corrent elèctric sense gens de resistència per sota d'una certa temperatura. Es produeix en molts materials, des de l'alumini a materials ceràmics i cuprats, com els famosos YBaCuO. Fou descoberta el 1911 per Kamerlingh Onnes i es caracteritza, a més de per la resistència nul·la al pas del corrent, per l'expulsió del camp magnètic de l'interior del material (efecte Meissner) i per una transició de fase (com el pas de gel a líquid de l'aigua, per exemple). L'explicació física de la superconductivitat «convencional» està clara gràcies a la teoria BCS, però la superconductivitat d'alta temperatura, descoberta el 1987 encara no té una explicació satisfactòria.
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