Retraction undermines the bold claim by physicists who said their material conducted electricity without resistance at 15 ˚C.
Credit: KTSDesign/Science Photo Libraryin which researchers claimed to have observed the first true room-temperature superconductor has been retracted.
Superconductors can carry large electric currents without producing any waste heat, and are key to many scientific and medical applications, as well as potentially to future energy-saving technologies. But most superconductors work only at temperatures approaching absolute zero . Only in recent years have physicists managed to get some to work above 0 ˚C using high-pressure anvils.
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