Sum Rules and Interlayer Conductivity of High-T$_c$ Cuprates

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 variet...

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Bibliographic Details
Published inScience (American Association for the Advancement of Science) Vol. 283; no. 5398; pp. 49 - 52
Main Authors Basov, D. N., Woods, S. I., Katz, A. S., Singley, E. J., Dynes, R. C., Xu, M., Hinks, D. G., Homes, C. C., Strongin, M.
Format Journal Article
LanguageEnglish
Published American Society for the Advancement of Science 01.01.1999
Subjects
Conductivity
Crystals
Cuprates
Infrared radiation
Infrared reflection
Kinetic energy
Phonons
Reflectance
Signal reflection
Superconductors
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Summary: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 variety of materials, including Tl$_2$Ba$_2$CuO$_{6+x}$, La$_{2-x}$Sr$_x$CuO$_4$, and YBa$_2$Cu$_3$O$_{66}$, 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.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.283.5398.49