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. En-effet-la-conductivité-thermique-du, cuivre à basse température est limitée par la diffusion des électrons sur les impuretés et dislocations. Par exemple, en dessous de 10 à 20 K, un cuivre recuit particulièrement pur (RRR de 1000) est plus de 10 fois meilleur conducteur qu'un cuivre recuit médiocre