5 July 1996 New family of copper-oxide-based isotropic metallic oxides for normal metal barriers in SNS junctions
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Abstract
Thin films and heterostructures of a new family of copper- oxide-based isotropic metallic oxides such as La6.4Sr1.6Cu8O20, La5BaCu6O13 and La6BaYCu8O20 have been investigated. These metallic oxides are oxygen deficient pseudo-cubic perovskites that exhibits Pauli paramagnetism, which could be ideal normal metals for SNS junctions in high Tc superconducting devices. We have grown epitaxial thin films of these metallic oxides and SNS superconducting heterostructures in situ by 90 degrees off-axis sputtering. X-ray diffraction and cross-sectional transmission electron microscopy reveal these heterostructures to have high crystalline quality and clean interfaces. This material will facilitate fabrication of ideal SNS Josephson junctions with low boundary resistance due to its excellent chemical compatibility and lattice match with cuprate superconductors and will be useful for determining the source of interface resistance in such heterostructures.
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Chang-Beom Eom, Chang-Beom Eom, } "New family of copper-oxide-based isotropic metallic oxides for normal metal barriers in SNS junctions", Proc. SPIE 2697, Oxide Superconductor Physics and Nano-Engineering II, (5 July 1996); doi: 10.1117/12.250237; https://doi.org/10.1117/12.250237
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