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Science 1 February 2002:
Vol. 295. no. 5556, p. 787
DOI: 10.1126/science.295.5556.787
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News Focus

SUPERCONDUCTORS:
YBCO Confronts Life in the Slow Lane

Robert F. Service

While MgB2 researchers are already gearing up efforts to make kilometers of wire, researchers working with the top-of-the-line high-temperature superconductor are struggling for every meter. Six years after it was reported that a brittle ceramic superconductor composed of yttrium, barium, copper, and oxygen deposited atop a thin metal tape could carry a phenomenal 1 million amperes of electrical current per square centimeter of cross section, researchers still can't make tapes longer than a meter.

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