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Science 24 April 2009:
Vol. 324. no. 5926, pp. 452 - 453
DOI: 10.1126/science.324_452a
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News of the Week

German Physical Society:

A New Take on Doping in Iron-Based Superconductors

Adrian Cho

At the German Physical Society meeting, researchers reported on new data suggesting that a key step in making both iron-based and copper-based superconductors--"doping" them with impurities--plays a very different role in each of the two families. In the cuprates, doping produces superconductivity by adjusting the number of electrons in the current-carrying copper-and-oxygen planes. But in the iron-and-arsenic compounds, doping appears to induce superconductivity by altering the material's crystal structure.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)