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The Hot Question: How New Are the New Superconductors?

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Science  16 May 2008:
Vol. 320, Issue 5878, pp. 870-871
DOI: 10.1126/science.320.5878.870

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Do iron-and-arsenic superconductors work the same way as the older, inscrutable copper-and-oxygen compounds? Early evidence points both ways.