CeO{sub 2} compatibility with YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} in superconducting-film multilayers
Journal Article
·
· Physical Review, B: Condensed Matter
- Department of Physics and Engineering Physics, Chalmers University of Technology and Goeteborg University, S-41296 Goeteborg (Sweden)
- Department of Physics, University of California, Santa Cruz, California 95064 (United States)
High-quality superconducting (T{sub c}{approx}90K, j{sub c}{gt}10{sup 6}A/cm{sup 2} at 77 K) epitaxial (001) YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} films were grown by laser ablation on (001) CeO{sub 2}/(11{underscore}02) Al{sub 2}O{sub 3}. An interaction between YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} and CeO{sub 2} would influence the structure and the superconducting parameters. A marked degradation of the superconducting transition temperature (T{sub c}=74K) was observed when twenty 2-nm-thick CeO{sub 2} layers were inserted equidistantly into a (001) YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} film (200 nm). BaCeO{sub 3} crystalline inclusions were detected by x-ray diffraction. X-ray-absorption fine-structure investigations at the Cu-K edge indicate that Ce substitutes for Y in YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}. Near-edge x-ray-absorption studies indicate that the valence of Ce incorporated into the YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} regions of the multilayer structure is also +4. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 544929
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 17 Vol. 56; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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