Strong Pinning in High Temperature Superconductors

Details Strong Pinning in High Temperature Superconductors Strong Pinning in High Temperature Superconductors

2002-02-14

arxiv.org/abs/cond-mat/0202243v2

PHYSICAL REVIEW B 66, 024523 (2002)

Physics

Condensed Matter

Superconductivity

11 pages; 8 Figures; Published Phys. Rev. B 66, 024523 (2002)

Scientific paper

10.1103/PhysRevB.66.024523

Detailed measurements of the critical current density jc of YBa2Cu3O7 films grown by pulsed laser deposition reveal the increase of jc as function of the filmthickness. Both this thickness dependence and the field dependence of the critical current are consistently described using a generalization of the theory of strong pinning of Ovchinnikov and Ivlev [Phys. Rev. B 43, 8024 (1991)]. From the model, we deduce values of the defect density (10^21 m^-3) and the elementary pinning force, which are in good agreement with the generally accepted values for Y2O3-inclusions. In the absence of clear evidence that the critical current is determined by linear defects or modulations of the film thickness, our model provides an alternative explanation for the rather universal field dependence of the critical current density found in YBa2Cu3O7 films deposited by different methods.

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