The True Colors of Cuprates

Science  22 Mar 2002:
Vol. 295, Issue 5563, pp. 2226-2227
DOI: 10.1126/science.1070866

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In the early days of superconductivity, superconductors were expected to be good reflectors of high-frequency radiation. Initial experiments did not fulfill this expectation, however, and were abandoned after theory failed to find a mechanism for such reflectivity. In his Perspective, Hirsch highlights the report by Molegraaf et al., who have found experimental evidence for enhanced high-frequency reflection from high-temperature superconductors. The results suggest that high-temperature superconductivity is driven by charge carriers being happy "moving" together, even if they are uncomfortable in each other's presence.