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Comparison of the electrodynamic properties of sintered YBa/sub 2/Cu/sub 3/O/sub 7-//sub y/ and La/sub 1. 85/Sr/sub 0. 15/CuO/sub 4-//sub y/

Journal Article · · Phys. Rev. B: Condens. Matter; (United States)
The reflectivity in the superconducting and normal states of YBa/sub 2/Cu/sub 3/O/sub 7-//sub y/ has been reproduced with the effective-medium theory plus an anisotropic dielectric function and the Mattis-Bardeen conductivity with a gap value 2..delta../k/sub B/T/sub c/ = 2.5 to 2.7. We find that the lowest ir-active phonon polarized in the high-conductivity plane produces structure in the superconducting gap, the lowest-frequency phonon perpendicular to the plane is overdamped, and that the electronic susceptibility is more isotropic for YBa/sub 2/Cu/sub 3/O/sub 7-//sub y/ than for La/sub 1.85/Sr/sub 0.15/CuO/sub 4-//sub y/.
Research Organization:
Laboratory of Atomic and Solid State Physics and Materials Science Center, Cornell University, Ithaca, New York 14853-2501
OSTI ID:
5530521
Journal Information:
Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 36:16; ISSN PRBMD
Country of Publication:
United States
Language:
English

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