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Chemical Doping and Physical Properties of the New High Temperature Superconducting Perovskites
Abstract The effects of chemical doping on the structural, magnetic, transport and superconducting properties of the new high Tc superconducting oxides are reviewed. The substitution of Sr or rare earths for La in La2CuO4−y and the replacement for Y by rare earths and for Ba by Sr in the YBa2Cu3O7−y system have been investigated, as well as the substitution of Ni for Cu in both systems. In contrast to the rare earth substitutions, a Ni substitution dramatically affects Tc. The importance of the oxygen content (y) in these oxides, which strongly depend on their processing conditions (heat treating time, temperature and ambient), is emphasized and a detailed study of changes in the physical properties as a function of y is reported. The superconducting properties of these perovskites can be destroyed by decreasing their oxygen content. However, full superconductivity can be recovered by reannealing the sample under oxygen or by a low temperature (80°C) plasma oxidation. This later method may be very useful for the technological application of these materials.
Chemical Doping and Physical Properties of the New High Temperature Superconducting Perovskites
Abstract The effects of chemical doping on the structural, magnetic, transport and superconducting properties of the new high Tc superconducting oxides are reviewed. The substitution of Sr or rare earths for La in La2CuO4−y and the replacement for Y by rare earths and for Ba by Sr in the YBa2Cu3O7−y system have been investigated, as well as the substitution of Ni for Cu in both systems. In contrast to the rare earth substitutions, a Ni substitution dramatically affects Tc. The importance of the oxygen content (y) in these oxides, which strongly depend on their processing conditions (heat treating time, temperature and ambient), is emphasized and a detailed study of changes in the physical properties as a function of y is reported. The superconducting properties of these perovskites can be destroyed by decreasing their oxygen content. However, full superconductivity can be recovered by reannealing the sample under oxygen or by a low temperature (80°C) plasma oxidation. This later method may be very useful for the technological application of these materials.
Chemical Doping and Physical Properties of the New High Temperature Superconducting Perovskites
Tarascon, J. M. (author) / Greene, L. H. (author) / Bagley, B. G. (author) / McKinnon, W. R. (author) / Barboux, P. (author) / Hull, G. W. (author)
Novel Superconductivity ; 705-724
1987-01-01
20 pages
Article/Chapter (Book)
Electronic Resource
English
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