Perspectives

Cuprates Fall into a Gap

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Science  19 Jul 1996:
Vol. 273, Issue 5273, pp. 321-322
DOI: 10.1126/science.273.5273.321

Summary

Superconductors are characterized by an energy gap that is a measure of the robustness of the superconducting state. Recent experimental evidence has indicated the existence of another energy gap at a higher temperature. As discussed in a Perspective by Ong, electron photoemission results reported by Loeser et al. in this issue (p. 325) provide a clearer picture of this second gap and may allow further discrimination among competing models of high-temperature superconductivity.