Effect of hydrogen intercalation on the critical parameters of YBa2Cu3Oy |
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Authors: | I. B. Bobylev E. G. Gerasimov N. A. Zyuzeva P. B. Terent’ev |
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Affiliation: | 1.Institute of Metal Physics, Ural Branch,Russian Academy of Sciences,Ekaterinburg,Russia;2.Ural Federal University,Ekaterinburg,Russia |
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Abstract: | The effect of hydrogenation at T = 150 and 200°C on the electrophysical properties of highly textured YBa2Cu3O y ceramics with different oxygen content has been investigated. Like hydration, hydrogenation results in the deterioration of these properties. However, in samples with high oxygen contents (y = 6.96) hydrogenated at T = 150°C after oxidation (400°C) or recovery annealing with subsequent oxidation, the critical current density and first critical field increase compared to the initial state. The improvement of the properties occurs mainly in a magnetic field applied perpendicularly to the c axis. As after hydration, this is connected with the formation of planar defects in the course of low-temperature annealing. In addition, in the process of the hydrogenation, the partial reduction of copper occurs with the formation of microinclusions of Cu2O and other products of chemical decomposition, which are extra pinning centers of magnetic vortices. |
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