ANISOTROPY STUDIES ON ALIGNED HGBA2CACU2O6- CONFIRMATION OF THE COLLECTIVE-PINNING THEORY FOR ANISOTROPIC MATERIALS(DELTA POWDER )

Investigations on aligned HgBa2CaCu2O6+delta(Hg-1212) powder were perf ormed by measuring magnetization parallel and perpendicular to the app lied magnetic field as a function of temperature, field, and the field orientation in the irreversible regime. The anisotropy ratio epsilon approximate to 1/5 is found indicating that Hg-1212 is one of the leas t anisotropic materials among the technically important high-T-c super conducting families. The scaling results for the magnetic field and th e in-plane and the out-of-plane critical current densities agree preci sely with the collective pinning theory and its scaling approach for a nisotropic materials.