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Influence of naturally grown nanoparticles at the buffer layer in the flux pinning in YBa2Cu3O7 coated conductors

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We have studied the influence of naturally grown SrTiO3 particles at the buffer layer surface on the in-field critical current density (Jc) dependence of coated conductors. The presence of the SrTiO3 particles induces the growth of extra-correlated pinning along the c-axis direction in the YBa2Cu3O7 films that thread samples as thick as 5m. These correlated pinning centres produce a bigger c-axis peak and effectively reduce the Jc magnetic field (H) decay characterized by a smaller exponent α of the &J_{\mathrm {c}} \propto H^{-\alpha } ; power law decay. This method opens up a new approach for how to increase Jc under an applied magnetic field without the need for an extra process. This study brings new meaning to the so-called optimal deposition conditions, since it will depend on the field and temperature region of the application.

Document Type: Research Article

DOI: http://dx.doi.org/10.1088/0953-2048/19/9/001

Publication date: September 1, 2006

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