SERQUIS Adriana Cristina
Identification of intrinsic ab-plane pinning in YBa2Cu3O7 thin films and coated conductors
L. CIVALE; B. MAIOROV; J. L. MACMANUS-DRISCOLL; H. WANG; T. G. HOLESINGER; S. R. FOLTYN; A. SERQUIS; P. N. ARENDT
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
Año: 2005 vol. 15 p. 2808 - 2811
The angular-dependent critical current density in YBa2Cu3O7 films grown by pulsed laser deposition exhibit asharp peak for magnetic field orientations near the ab plane, which arises from the combined effects of intrinsic pinning and extended defects parallel to the planes. An analysis of the temperature and field dependence of the height and width of this peak allows us to distinguish both contributions. We find that, in a film on single crystal substrate, the peak at low fields is due primarily to the extended defects, but at high fields it is dominated by intrinsic pinning.We compare these results with those of coated conductors with a larger density of ab-oriented correlated defects. We show a novel effect consisting in an inverse correlation between and the power law exponent (N) of the I-V curves that only occurs in the intrinsic-pinning dominated regime, and we present an interpretation of its origin.