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Bulk Superconductivity at 60 K in Oxygen-Deficient Ba2YCu3O7-δ, and Oxygen Isotope Effect in La1.85Sr0.15CuO4
Abstract Oxygen deficient polycrystalline samples of Ba2YCu3O7-δ have been prepared by a Zr-gettered annealing technique. A distinct bulk superconducting phase with a Tc of 60 K is found for 0.3<δ<0.4, which has partial ordering of the O vacancies in the Cu-O chains. This ordering is seen in electron diffraction studies and also in both the value and the temperature dependence of the electrical resistivity. Isotope effect studies on Lai1.35 Sr0.15CuO4 have been performed by partially substituting 18O for 16O. Raman spectroscopy confirms the expected frequency shift of the 428 cm-1 phonon line and Tc is found to decrease. The isotope effect exponent α is 0.16 ± 0.02, in contrast to Ba2YCu3O7 where α is 0 ± 0.02.
Bulk Superconductivity at 60 K in Oxygen-Deficient Ba2YCu3O7-δ, and Oxygen Isotope Effect in La1.85Sr0.15CuO4
Abstract Oxygen deficient polycrystalline samples of Ba2YCu3O7-δ have been prepared by a Zr-gettered annealing technique. A distinct bulk superconducting phase with a Tc of 60 K is found for 0.3<δ<0.4, which has partial ordering of the O vacancies in the Cu-O chains. This ordering is seen in electron diffraction studies and also in both the value and the temperature dependence of the electrical resistivity. Isotope effect studies on Lai1.35 Sr0.15CuO4 have been performed by partially substituting 18O for 16O. Raman spectroscopy confirms the expected frequency shift of the 428 cm-1 phonon line and Tc is found to decrease. The isotope effect exponent α is 0.16 ± 0.02, in contrast to Ba2YCu3O7 where α is 0 ± 0.02.
Bulk Superconductivity at 60 K in Oxygen-Deficient Ba2YCu3O7-δ, and Oxygen Isotope Effect in La1.85Sr0.15CuO4
Batlogg, B. (author) / Cava, R. J. (author) / Chen, C. H. (author) / Kourouklis, G. (author) / Weber, W. (author) / Jayaraman, A. (author) / White, A. E. (author) / Short, K. T. (author) / Rietman, E. A. (author) / Rupp, L. W. (author)
Novel Superconductivity ; 653-657
1987-01-01
5 pages
Article/Chapter (Book)
Electronic Resource
English
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