Kh A Ziq 2001 Supercond. Sci. Technol. 14 30 doi:10.1088/0953-2048/14/1/305
Kh A Ziq
Show affiliationsMagnetic measurements have been used to evaluate the critical current density Jc for YBa2Cu3Ox samples with various oxygen content (x) and, for partially oxygenated samples (x~6.5), with different degrees of oxygen disorder. The current density has been expressed in terms (T/Tc)-δ, where δ decreases linearly with x for x<6.6 and becomes constant for 6.6<x<7. Moreover, the variation in Tc with oxygen content has been used to represent Jc as Jc = Jo (x/Tc)-n, where Jo is almost constant and n is temperature dependent. At a given temperature ratio (T/Tc), the oxygen disorder enhances the critical current density and weakens its field dependence. It is argued that the increased number of Cu(1)+3O clusters with increasing disorder may cause additional pinning centres and affect the Jc behaviour.
74.62.Bf Effects of material synthesis, crystal structure, and chemical composition
Issue 1 (January 2001)
Received 13 June 2000, in final form 12 October 2000
Kh A Ziq 2001 Supercond. Sci. Technol. 14 30
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