Oxygen Content Change Characters and the Influence Superconductivity in the Doped YBCO Systems

Abstract:

The YBa₂Cu_3-x(doped element)_xO_7-δ samples were prepared by solid-state reactions and studied by means of XRD, positron annihilation technique and simulation calculation. The results show the local electron density n_e saturation and variations of oxygen content, which can be explained by the cluster effect. Another important new result is that the superconductivity does not depend directly on the valence electron density with different dopant. The T_c seems to lose the association with the n_e variation. The dopants can be regarded as a kind of defects is similarly an adding or a losing oxygen ion. Oxygen interstitials reflect fractal distributions of dopants. The oxygen content and distribution reflect the superconductivity of the samples.

• Periodical: Advanced Materials Research (Volumes 535-537)
• Pages: 1241-1246
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.535-537.1241
• Online since: June 2012
• Authors: Yan Qin Huang
• Keywords: Elemental Substitution, Local Electron Density N_e, Positron Annihilation, Simulation Analysis

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