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Science 21 November 1997:
Vol. 278. no. 5342, p. 1377
DOI: 10.1126/science.278.5342.1377c
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This Week in Science

The parent compounds of the high-temperature superconductors are antiferromagnetic insulators. Blumberg et al. (p. 1427) performed electronic Raman scattering studies of the superconducting bismuth cuprate compound to see how such ordering may evolve into the superconducting state. At temperatures well above the superconducting transition temperature, possible precursors to superconductivity develop, such as long-lived hole states with dx2-y2 symmetry and a binding energy of 75 millielectron volts. As the temperature is decreased, greater coherence is seen in the electronic system and a pseudogap opens up in the spectrum.

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