We have studied the influence of naturally grown SrTiO 3 particles at the buffer layer surface on the in-field critical current density (J c ) dependence of coated conductors. The presence of the SrTiO 3 particles induces the growth of extra-correlated pinning along the c-axis direction in the YBa 2 Cu 3 O 7 films that thread samples as thick as 5 µm. These correlated pinning centres produce a bigger c-axis peak and effectively reduce the J c magnetic field (H) decay characterized by a smaller exponent α of the J c ∝ H −α power law decay. This method opens up a new approach for how to increase J c 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.

No abstract