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Science 11 December 1998:
Vol. 282. no. 5396, p. 1953
DOI: 10.1126/science.282.5396.1953d
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This Week in Science

Figure 1

High-temperature superconductors (HTSs) exhibit an unusual "d-wave" symmetry in the energy gap that separates the superconducting and insulating states. Whether a gap exists depends on the momentum of the electrons, and this behavior is not readily accounted for theoretically. Ronning et al. (p. 2067; see the news story by Service) suggest a possible origin for this gap symmetry--it may already be present in the parent insulating state. Photoemission spectra of a Mott insulator related to HTSs, Ca2CuO2Cl2, show that a remnant Fermi surface is present (defined in this case as a sharp drop in electron occupancy probability as a function of momentum) and that the d-wave shape is similar to that of the HTS superconducting gap.




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