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Science 1 January 1999:
Vol. 283. no. 5398, pp. 49 - 52
DOI: 10.1126/science.283.5398.49
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Reports

Sum Rules and Interlayer Conductivity of High-Tc Cuprates

D. N. Basov, S. I. Woods, A. S. Katz, E. J. Singley, R. C. Dynes, M. Xu, * D. G. Hinks, C. C. Homes, M. Strongin

Analysis of the interlayer infrared conductivity of cuprate high-transition temperature superconductors reveals an anomalously large energy scale extending up to midinfrared frequencies that can be attributed to formation of the superconducting condensate. This unusual effect is observed in a va- riety of materials, including Tl2Ba2CuO6+x, La2-xSrxCuO4, and YBa2Cu3O6.6, which show an incoherent interlayer response in the normal state. Midinfrared range condensation was examined in the context of sum rules that can be formulated for the complex conductivity. One possible interpretation of these experiments is in terms of a kinetic energy change associated with the superconducting transition.

D. N. Basov, S. I. Woods, A. S. Katz, E. J. Singley, R. C. Dynes, Department of Physics, University of California-San Diego, La Jolla, CA 92093-0319, USA. M. Xu, James Franck Institute, University of Chicago, Chicago, IL 60637, USA. D. G. Hinks, Department of Materials Science, Argonne National Laboratory, Argonne, IL 60439, USA. C. C. Homes and M. Strongin, Department of Physics, Brookhaven National Laboratory, Upton, NY 11973-5000, USA.
*   Present address: Lucent Technologies, 2000 North Naperville Road, Naperville, IL 60566, USA.

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