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Sum rules and interlayer conductivity of high-Tc cuprates
1D. 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,
Science (New York, N.Y.)
|January 5, 1999
Summary
Superconducting condensates in cuprates exhibit a large energy scale in the mid-infrared range, suggesting a change in kinetic energy during the superconducting transition.
Area of Science:
- Condensed matter physics
- Materials science
- Superconductivity
Background:
- Cuprate high-transition temperature superconductors exhibit unique electronic properties.
- Understanding the nature of the superconducting condensate is crucial for advancing superconductor technology.
Purpose of the Study:
- To analyze the interlayer infrared conductivity of cuprate superconductors.
- To investigate the energy scale of the superconducting condensate in the mid-infrared frequency range.
Main Methods:
- Analysis of interlayer infrared conductivity.
- Examination of mid-infrared range condensation using sum rules for complex conductivity.
Main Results:
- An anomalously large energy scale was observed up to mid-infrared frequencies.
- This effect is attributed to the formation of the superconducting condensate.
- The phenomenon was observed in various cuprate materials like Tl2Ba2CuO6+x, La2-xSrxCuO4, and YBa2Cu3O6.6.
Conclusions:
- The observed mid-infrared condensation provides insights into the superconducting condensate.
- A possible interpretation involves a change in kinetic energy associated with the superconducting transition.
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