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Far-infrared composite-medium study of sintered La/sub 2/NiO/sub 4/ and La/sub 1. 85/Sr/sub 0. 15/CuO/sub 4-//sub y/

Journal Article · · Phys. Rev. B: Condens. Matter; (United States)
The infrared and far-infrared properties of sintered La/sub 2/NiO/sub 4/ and La/sub 1.85/Sr/sub 0.15/CuO/sub 4-//sub y/ are modeled accurately within the effective-medium approximation. The electrodynamic properties of La/sub 1.85/Sr/sub 0.15/CuO/sub 4-//sub y/ grains are highly anisotropic with the strong 0.5-eV electronic transition polarized along the low-conductivity crystal direction. The apparent superconducting gap frequency for the sintered material depends crucially on the grain geometry. Our experimental data are fit with needlelike crystallites and 2..delta../k/sub B/T/sub 0/ = 2.6.
Research Organization:
Laboratory of Atomic and Solid State Physics and Materials Science Center, Cornell University, Ithaca, New York 14853-2501
OSTI ID:
6040373
Journal Information:
Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 36:10; ISSN PRBMD
Country of Publication:
United States
Language:
English