Abstract
Textured YBa 2Cu 3O 7 superconducting samples have been prepared by melt texturing growth (MTG) under variable conditions. We have investigated low field magnetic susceptibility (d.c. and a.c.), high field hysteresis loops and magnetic irreversibility through ZFC-FC temperature scans. We show that low field flux penetration effects, measured by screening capability and dissipative behaviour, may be convenient to detect residual weak links and to characterize the degree of texturation when their anisotropic behaviour is analysed. Critical currents up to 2 × 10 5 A cm −2 at 1 T and 25 K and for H | c have been obtained and their temperature and field dependence determined. We find that enhanced critical currents in the H | c configuration also lead to an increase in the magnetic anisotropy, which probably reflects reduced misorientation of the crystallites within a domain.
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