title: Sum rules and interlayer conductivity of high-Tc cuprates
abstract: 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.
authors.affiliation: 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,
authors.initials: DN
authors.lastname: Basov
authors.initials: SI
authors.lastname: Woods
authors.initials: AS
authors.lastname: Katz
authors.initials: EJ
authors.lastname: Singley
authors.initials: RC
authors.lastname: Dynes
authors.initials: M
authors.lastname: Xu
authors.initials: DG
authors.lastname: Hinks
authors.initials: CC
authors.lastname: Homes
authors.initials: M
authors.lastname: Strongin