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Currents without borders

Following the discovery of superconductivity at liquid-nitrogen temperatures, the idea of making ‘superwires’ soon ran into problems. Structural impurities remain the main obstacle, but a high dose of calcium may be the answer.

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Figure 1: How to mend a faulty superwire.


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Correspondence to Paul M. Grant.

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Grant, P. Currents without borders. Nature 407, 139–140 (2000).

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